The total of all forces acting on an object is known as the net force. A mass can accelerate due to net force.
How to calculate net force ?The total of all forces acting on an object is known as the net force. A mass can accelerate due to net force. Whether a body is at rest or in motion, it is subject to another force. When there are a lot of forces acting on a system, the term "net force" is used.
here r12 = 0.550m r23= = 0.550m Then the distance from the first charge to the third one will be:
r13 =r12+r23=0.550+0.550 = 1.1m
According to the Coulomb's law, the net force on particle q2 will be equal to the sum of the forces on particle q2 from the particle q1 and q3.
F3+=F13+F23=q1q2/r²13 + k q3q2/r²23
Where k = 9×[tex]10^{9}[/tex] N m²/C²
Substituting numerical values, obtain:
F3= 9×[tex]10^{9}[/tex](-66.3 × [tex]10^{-6}[/tex])(-43.2×9×[tex]10^{-6}[/tex])/1.45²+9 ×[tex]10^{9}[/tex] 108×[tex]10^{-6}[/tex](-43.2 ×[tex]10^{-6}[/tex])/0.550²
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when poked by a spear, an operatic soprano lets out a 1,100-hz shriek. what is its wavelength if the speed of sound is 344 m/s?
The wavelength of the wave produced by the sound is found as 0.312 m.
Explain the relation of wavelength and velocity?As a result, an increase in just about any one quantity while maintaining a constant value for the other will increase the wave speed, which is mathematically equal to that product of the wave's wavelength and linear frequency.Mathematically: v = fλ;
In which;
v = speed of the waveλ = wavelength of the wavef = frequency of the waveThe given data for the question-
f = 1100 Hz ; frequency of sound
v = 344 m/s; speed of the sound
λ = wavelength of the wave
Put the value in the formula;
344 = 1100 x λ
λ = 344/1100
λ = 0.312
Thus, the wavelength of the wave produced by the sound is found as 0.312 m.
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If we have a new moon today, when we will have the next full moon?
in about 6 months
in about a month
in about 2 weeks
in about 1 week
If we have a new moon today, we will have the next full moon in about 2 weeks.
What is the time difference between a new moon and the next full moon?The midpoint of the cycle (half of 30 = 15) is marked by the full Moon, which occurs approximately 15 days (14.8 to be exact) following the new moon. Similar to the New Moon phase, the Moon is once again in alignment with the Earth and Sun during full moon.
However, this time, the Moon is on the other side of the Earth, thus the full area of the Moon that is illuminated by the Sun is facing us. Immediately following this brief interval, visibility starts to decline.
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what experimental evidence would lead to the student to conclude that free fall acceleration is constant acceleration
The distance fallen is proportional to the square of the falling time.
A graph of velocity vs. time is linear.
What is acceleration?In mechanics, acceleration is the rate at which an object's velocity with respect to time changes. Vector quantities include accelerations. The direction of the net force imposed on an object determines its acceleration in relation to that force. acceleration is the rate of change in both speed and direction of velocity over time.When anything moves faster or slower in a straight line, it is said to have been accelerated. Because the direction is always shifting, motion on a circle accelerates even while the speed is constant.The equation a = v/t denotes acceleration (a), which is the change in velocity (v) over the change in time (t).The distance fallen is proportional to the square of the falling time.
A graph of velocity vs. time is linear.
The complete question is,
A student conducts an investigation into the motion of a car that accelerates from rest on a straight, level roadway. A driver operating the car causes the car to speed up from rest at time t = 0 and the student makes measurements of the distance traveled and the speed of the car every second. What experimental evidence would support the conclusion that the car's acceleration is uniform? Select two answers.
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what are ways that iron man's repulsor rays don't break newton's third law of motion.
Tony's Arc Reactor serves as the power source for the Repulsors, which are located in the palms of the armor.Originally intended to stabilize the flight of the armor and add more agility.
How is push produced by the Iron Man suit?Hydrogen is the gas utilized, and a sophisticated suit like Iron Man can easily extract it from the air by electrolysis. The water was condensed even as suit overpressurized ram air into form water, as well as the hydrogen gas is formed and sent right to the rocket boots.
What fuels Tony Stark's armor?The nuclear core which Tony Stark creates and implants in his heart to save his life also fuels all of his armor.In essence, it is a very energy-dense battery.
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The force opposing the normal force is?
A. Static friction
B. Applied
C. Gravity
D. Kinetic friction
E. None of the above
the direction of the force of sliding friction is always select one to that of velocity of the object and is select one static friction.
The direction of the force of sliding friction is always that of velocity of the object.
What is Static friction?Moving against the surface's normal, the force of sliding friction acts in a direct proportion to the weight.
Sliding or kinetic friction is the resistance to the actual relative sliding motion between two surfaces in contact.Let's start by learning about frictional forces from a basic understanding. If a metal block is on a table, it might not move in response to a weak force.
The metal block begins to move as the force is gradually increased.The resistive force provided by the metal block in its static form is the same as the controlling value of the force at which the metal block begins to move.Static Friction is the name given to this resistive force. The metal block starts to budge as the experiment continues and the force is increased.Moving against the surface's normal, the force of sliding friction acts in a direct proportion to the weight. In particular, if the surface on which the body slides is horizontal, the normal force will be equal to the object's weight.
Thus, F = u tanα
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500 joules of heat is absorbed by a system that does 200 j of work on its surroundings. 1) what is the change in the internal energy of the system? (express your answer to one significant figure.)
The change in the internal energy of the system is 3 *10^2 J
Work is done by system.
Hence work is negative.
Change in internal energy=500-200 = 300=3 *10^2 J
law of conservation Energy:
The law of conservation of energy states that energy is neither created nor destroyed, and can only be converted from one form of energy to another. This means that the same amount of energy is always available in the system unless supplied externally. This is especially confusing for non-conservative forces where the energy is converted from mechanical to thermal but the total energy remains the same. The only way to use energy is to convert it from one form to another.
The energy content of each system is determined by the formula:
UT=Ui+W+Q
where;
.UT is the total internal energy of the system.
.Ui is the initial internal energy of the system.
.W is work done by or on the system.
.Q is the heat added to or removed from the system. It is also possible to determine the change in internal energy of the system using the
equation: ΔU=W+Q
This is also a statement of the first law of thermodynamics.
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what is inertia.....
Answer: Inertia is an object’s resistance to a change in its motion. The greater the mass of an object, the greater the force needed to move it or stop it from moving.
Explanation: Hope this was helpful
If you thrust a magnet into a closed loop of wire, the loop will
a.rotate
b.have current in it
c.both of the above
d. none of the above
If you thrust a magnet into a closed loop of wire, the loop will have current in it. So the correct option is B.
What is a magnet?A magnet is a body with a magnetism that can attract different irons that can be given naturally or artificially. Magnets can have their magnetic field continuously and this field can attract materials or repel them, this will depend on the magnetic permeability of the compound. The magnetic field of the images will be oriented towards the south pole and the north pole and each of these will be attracted by their opposites.
Not all magnets have permanent magnetism, this depends on whether they are going to be magnetized to be permanent or if they will only have temporary functionality.
By pushing a magnet in a closed circuit of wire, a magnetic field will be generated in which a current will flow in the turns of wire.
Therefore, we can confirm that the correct option is B. have current in it.
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you add equal amounts of heat to two identical cylinders containing equal amounts of the same ideal gas. cylinder a is allowed to expand, while cylinder b is not. Part A How do the temperature changes of the two cylinders compare?
By ideal gas theory, cylinder b has the higher temperature do the temperature changes of the two cylinders compare.
What is an ideal gas explain?The phrase "ideal gas" describes a fictitious gas made up of molecules that adhere to the following principles: No attraction or repellence exists between the molecules of ideal gases. The sole action between molecules of an ideal gas would be an energetic collision when they collided or an athletic collision with the container walls.
Briefing:To answer this issue, we must be familiar with the ideal gas theory. The ideal gas is depicted by
P . V = n . R . T
where R is the ideal gas constant, T is the temperature, n is the number of molecules, P is the pressure, V is the volume, and.
We can infer from the given query that
Pa = Pb = P
na = 3nb
Find the cylinder's temperature in a
P . V = n . R . Ta
Ta = P . V /( na . R )
Substitute na
Ta = P . V /( (3nb) . R )
Ta = (1/3) x (P . V /( (nb . R ))
Find the temperature of the cylinder b
P . V = n . R . Tb
Tb = P . V /( nb . R )
The temperature in cylinder an is three times lower than that in cylinder b.
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Which of the following device can be used for measurement of frequency?
a) Voltmeter
b) Ammeter
c) Stroboscope
d) None of the mentioned
A stroboscope is a tool for measuring frequency that makes use of a second reference voltage with a predetermined frequency. Ammeters are used to measure current, while Voltmeters are used to measure voltage.
Which two instruments are used to measure frequency?
We provide two different types of frequency meters among our measuring tools: laboratory frequency meters (tabletop), which have a measurement range of 0.1 Hz to 1.5 GHz, and pocket frequency meters, which have a measurement range of 10 Hz to 2,6 GHz.
What is a frequency measurement device?
A gadget that shows the periodicity of an electrical signal is a frequency meter. The employment of various mechanical frequency meters has changed over time, but since the 1970s, digital frequency counts have mostly taken their place.
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if the ring is off center when it hits the disk how will that affect the results? think about the effect on the moment of inertia
If the ring is off-center when it hits the disk, the disk will still spin, but the moment of inertia will be affected.
The off-center location of the ring will cause the disk to be unbalanced, which will cause the moment of inertia to be lower than it would be if the ring were centered. This means that the disk will not spin as rapidly or as long as it would if the ring were centered.
This means that the rotational energy of the ring will not be distributed evenly and the result will be an unbalanced, or skewed, rotation. This will cause an inaccurate measurement of the moment of inertia, as the off-center ring will not be able to provide a true representation of the rotational energy.
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a 5.00-m-long ladder, weighing 200 n, rests against a smooth vertical wall with its base on a horizontal rough floor, a distance of 1.20 m away from the wall. the center of mass of the ladder is 2.50 m from its base, and the coefficient of static friction between the ladder and the floor is 0.200. how far up the ladder, measured along the ladder, can a 600-n person climb before the ladder begins to slip?
When a 5.00 m-long ladder, with all weighing of 200 n, rests among a smooth vertical type of wall, then the ladder, will be measured among the the height = 0.488 m.
If θ be the angle ladder makes with the plane
cos θ = 1.2 / 5
Tan θ = 4.04
Let the height a person of weight 600 N can climb be h from the ground .
Distance from the base point where ladder touches the floor = h / tanθ
= h / 4.04
Total reaction force = total downward force
R = 200 + 600
800 N
Frictional force = μ R
= .2 x 800
= 160 N
Taking moment of force about the point on the ladder where it touches the floor and balancing them
= 200 x 1.2 x .5 + 600 x h / tanθ = μ R x 1.2 / tanθ ( reaction at the top point of ladder where it touches the wall is R₁ and R₁ =μ R )
= 200 x 1.2 x .5 + 600 x h / tanθ = 160 x 1.2 / tanθ
120 - 600 h / 4.04 = 47.52
120 - 47.52 = 600 h / 4.04
72.48= 148.51 h
h = 0.488 m
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compared to an omnidirectional antenna, a dish antenna quadruples radiated power. how much is this change in decibels
Change in decibels is 20 dB.
The power emitted by an antenna is measured in decibels (dB). Antenna gain, which is a measure of how strong the signal it transmits or receives is compared to a reference antenna, is also measured in dB.
To calculate the change in decibels due to a change in power, we can use the following formula:
change in dB = 10 × log10(new power / old power)
So comparing an omnidirectional antenna to a dish antenna, if the dish antenna quadruples the radiated power, the change in decibels is:
Change in dB will be 10 × log10(4 / 1)
= 10 × 2 = 20 dB
This means that a parabolic antenna has 20 dB more gain than an omnidirectional antenna.
It is important to note that this is only an approximation and the actual gain of an antenna depends on many factors such as antenna size, shape, orientation, and frequency of the signal being transmitted or received.
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Why does the Sun emit neutrinos? Solar flares create neutrinos with magnetic fields_ Convection releases neutrinos, which random walk through the radiation zone. The Sun does not emit neutrinos Neutrinos are a by-product of fusion in the Sun's core in step of the p-p process
The Sun emit neutrinos because of the fusion in the Sun's core creates neutrinos.
Most of the neutrinos that are currently flowing through you came from the sun. Every second, a hundred billion solar neutrinos travel through our fingernail.
Nuclear fusion occurs in the sun, where it results in the creation of neutrinos. Protons, the nucleus of the most basic element, hydrogen, combine during fusion to create helium, a heavier element.
As a result, neutrinos and energy are released, which will eventually manifest on Earth as light and heat.
These solar neutrinos represent an overall energy emission from the Sun of about 1%. Every second, the Sun emits 1038 neutrinos, each carrying 4 1024 W of electricity.
The sun's core can also be directly understood through the use of solar neutrinos. Unexpectedly, neutrinos generated in the sun's core reach to
Earth before light from the sun (formed in the same reaction), something we would not expect. This isn't because neutrinos can move more quickly than light since they can't.
Neutrinos encounter with matter so infrequently that they are able to immediately depart the sun's dense core, whereas photons (the light particles) bounce around before breaking free.
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Who of the following would be included in the Bureau of Labor Statistics' "unemployed" category?
a. Miguel, who is on temporary layoff.
b. Reta, who worked only 15 hours last week.
c. Marisa, who neither has or job or looking for one.
d. None of the above is correct.
The correct option is (d). none of the above is correct .For the "unemployed" category.
According to the Organization for Economic Co-operation and Development (OECD), unemployment is defined as those over a certain age (often 15) who are not now employed or self-employed but are nonetheless currently available for work during the reference period.The number of unemployed people as a percentage of the labour force serves as a proxy for unemployment, which is expressed as the unemployment rate (the total number of people employed added to those unemployed).To know more about unemployed
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a long, straight wire extends into and out of the screen. the current in the wire is
In the given scenario, the current is out of the screen following the right-hand rule. (Option A)
According to the figure provided the compass needle rotates in a counter-clockwise direction. The right-hand rule could be used to determine the direction of the magnetic field at the specific location. The right-hand rule states that to determine the direction of the magnetic force on a positive moving charge, point your right thumb in the direction of the velocity (v), your index finger in the direction of the magnetic field (B), and your middle finger will point in the direction of the resulting magnetic force (F). Hence, point the thumb in the direction that current is flowing and then curl the fingers around the line. Magnetic field direction will be indicated by the curling of fingers. Because the direction of rotation for the compass needle is in the opposite direction to clockwise, it would be counter- clockwise for the magnetic field direction. Hence, the current is out of the screen.
Note: The question is incomplete as it is missing options which are A) Out of the screen. B) There is no current in the wire. C) Into the screen. D) There is not enough information to tell the direction.
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Light passes through the entire thickness of the neural layer of the retina to excite the photoreceptors. True False
True, The vitreous fluid fills the anterior area of the eye. At which optic nerve exits the eyeball, the optic disc creates a blind patch.
What role does the retina play?Light that enters your eye is converted by the retina into electrical signals that your nerve cells sends to your brain, which produce the images you see. It's an important aspect of your vision. The coating at the back of our eyeball is called the retina.
What occurs if the retina is harmed?Loss of eyesight is frequently caused by retinal damage. According to medical professionals, blood vessels are impacted when the retina is hurt due to a disease or an accident. Between the brain and the optic nerve, neurons are transported by the veins. Neurons die when they are harmed, which prevents the brain from receiving visual information.
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Two economists agree that labor market discrimination against certain workers unfairly leads to lower wages for the disfavored group. Economist X argues that government intervention is most likely necessary to eliminate this unfair treatment, whereas Economist York argues that the best solution to the unfair treatment is to let the market work to eliminate it on its own.
Economist Y is most likely to be correct when labor and product markets are highly competitive and the lower wages of the disfavored group result from:
A. Differences in human capital
B. Statistical discrimination
C. Discrimination by employers
Answer: C. Discrimination by employers
Explanation:
Economist Y is most likely to be correct when labor and product markets are highly competitive and the lower wages of the disfavored group result from discrimination by employers.
option C is the correct answer.
What is labor discrimination?
Discrimination in the workplace happens when an employer treats his or her employee unfairly or unequally because of specific characteristics.
Labor market discrimination against certain workers unfairly leads to lower wages for the disfavored group.
Example of labor market discrimination include the following;
when an employee is fired, when an employee is demoted, or when an employee is denied promotion due to some unjustified causeAccording economist Y, government intervention cannot eliminate this unfair treatment since it is caused by the market (employers) and the best solution to the unfair treatment is to let the market (employers) work to eliminate it on its own.
Thus, economist Y is correct because this discrimination is caused by the market (employers).
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In a mechanical wave, the restoring force is the force that actually causes the oscillation. In which direction does a restoring force act?
A. opposite the direction of the propagation
B. opposite the direction of the displacement from equilibrium.
C. in the same direction as the displacement from equilibrium.
D. in the same direction as the propagation
The correct option B. opposite the direction of the displacement from equilibrium, is the direction of the restoring force.
Explain the propagation of the mechanical wave?Mechanical waves that move through a solid, liquid, or gas with a wave speed that is influenced by the elastic and inertial characteristics of that medium.
Mechanical waves can move in either longitudinal waves or transverse waves, which are the two most common wave motions.For a mechanical wave to propagate, the medium's elastic and inertial properties are crucial.A disruption or vibration in matter, if solid, gas, liquid, or plasma, is what generates mechanical waves. A medium is described as material through which waves are propagating. Sound waves are created by vibrations in a gas, while water waves are created by vibrations inside a liquid (air).Thus, the force that returns an object to its equilibrium position is known as the restoring force; it is denoted by a negative sign since its direction of action is the opposite of that of the displacement.
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Which of the following, if eliminated, would completely prevent the greenhouse effect from occurring on earth?
A. Chlorofluorocarbons (Incorrect)
B. Clouds (Incorrect)
C. Fossil fuels (Incorrect)
D. Acid rain
E. The ozone layer
F. Atmosphere
The green house gases can be reduced up to a limit by eliminating the fossil fuels and chlorofluorocarbons. Fossil fuels are the major source of greenhouse gases.
What are green house gases?Greenhouse gases are those which are capable of intense absorption of the temperature radiated from the earth's surface and make the earth atmosphere warm up.
Greenhouse gases are the main cause of global warming. Carbon dioxide, methane oxides of nitrogen and sulphur are the green house gases.
Fossil fuels are rich in hydrocarbons and they release these gases when burned. Mainly methane and other hydrocarbon gases intensely absorbs the temperature which is radiating away from the earth and thus the heat is trapped inside.
Therefore, by eliminating fossil fuels, greenhouse effect can be prevented.
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what is the average magnitude of the poynting vector 4.00 mi from a radio transmitter broadcasting isotropically (equally in all directions) with an average power of 260 kw?
307.4 μW/m² average magnitude of the pointing vector 4.00 mi with an average power of 250 kw
Power is produced when a force causes a displacement. Power has no bearing on how long it takes for a force to cause a displacement. The process's pace might range from swiftly concluding to taking some time.
For example, it takes an abnormally long time for a rock climber to elevate her body a few meters over the cliff's edge. On the other hand, a trail hiker may swiftly raise her body a few meters if she selects the faster path up the mountain. Despite making the same amount of work, the hiker completes the task far quicker than the rock climber..
S-average=power/area
power=260 kw
area=4π(8045)²
S-average=260/4π(8045)²
S-average=307.4 μW/m²
Therefore, the average magnitude with average power of 260 W is 307.4 μW/m²
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a tire has a tread pattern with a crevice every 2.25 cm. each crevice makes a single vibration as the tire moves. what is the frequency (in hz) of these vibrations if the car moves at 27.2 m/s?
The each crevice makes a single vibration as the tire moves. what is the frequency (in hz) of these vibrations if the car moves at 27.2 m/s Frequency =1208.9 Hz
From the question, we have
speed = 27.2 m/s = 2720 cm/s
The tire has a tread pattern with a crevice every 2.25 cm
frequency = 2720/2.25
=1208.9 Hz
Frequency :
The quantity of waves that pass a set location in a predetermined period of time is known as frequency. Therefore, if a wave passes through in half a second, the frequency is 2 per second. The frequency is 100 times per hour if it takes 1/100 of an hour. The frequency of the wave is the sum of all waves generated in a second. Frequency is the measure of how many vibrations occur per second. Here is a straightforward illustration: The frequency of the waves will be 5 hertz (Hz) or 5 cycles per second if five full waves are created in one second.
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a) power-driven scaling devices convert electrical energy (ultrasonic) or air pressure (sonic) into high-frequency sound waves. b) sound waves produce rapid mechanical vibrations in the specially designed scaling tips.
Ultrasonic scaler is the power-driven scaling instrument that convert a high-frequency electrical current into mechanical vibrations.
It operates in a frequency range between 25,000 to 50,000 cycles per second.Ultrasonic scaling device that generates a magnetic field and produces tip vibrations by the expansion and contraction of a metal stack or rod is called Magnetostrictive.Advantages of Ultrasonic Scaling:
Rapid removal of calculus deposits and plaque biofilm.Less clinician hand fatigue.Less patient discomfort.Disrupts bacterial colonies.Decreases tissue trauma.Less tissue distention.Decreases healing time.Allows for irrigation.Delivery of antimicrobials.Purposes and Uses of ultrasonic and sonic scaling:
Supragingival calculus & stain.Subgingival attached & unattached plaque, calculus, endotoxins.Initial debridement for NUG .Furcation debridement.Narrow pockets & difficult areas.Debridement prior to oral surgery.Removal of orthodontic cementum.Overhang removal.To know more about sound waves visit:
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suppose a guitar string has a resonant frequency of 329.6 hz and a q of 632. after you pluck the string, how many periods of oscillation would it take for the energy of the vibrating string to decay by a factor of e? how many seconds will that take?
It would take 100.6 periods of oscillations for the energy of vibrating string to decay in 0.305 seconds.
Resonance is defined as a system's tendency to vibrate with increased amplitude when frequencies are excited. The maximum frequency at which the amplitude is relatively maximum is referred to as the resonance frequency or resonant frequency. The sharpness of the resonance is defined by the Q factor.
Given,
resonant frequency, f = 329.6 Hz
Quality factor , Q = 632
We know that that quality factor is equal to [tex]2\pi[/tex] .i.e [tex]Q=2\pi[/tex]
then, for 2 periods of oscillations , the energy of vibrating string to decay by factor of 'e' be
[tex]Q=2\pi n\\\\632=2\pi n\\\\n=\frac{632}{2\pi}\\\\n=100.63[/tex]
then, the time elapsed can be determined by,
[tex]f=\frac{n}{T}\\\\329.6=\frac{100.63}{T}\\\\T=\frac{100.63}{329.6}=0.305s[/tex]
Thus, the energy of a vibrating string would decay in 0.305 seconds after 100.6 oscillations.
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"when the frequency of an ac circuit is increased, the current in the circuit does not change. which combination of elements is most likely to comprise the circuit?"
The elements are inductor , capacitor and resistors.
An LCR circuit, also known as a resonant circuit, tuned circuit, or an RLC circuit, is an electrical circuit consisting of an inductor (L), capacitor (C) and resistor (R) connected in series or parallel. The LCR circuit analysis can be understood better in terms of phasors. A phasor is a rotating quantity.Impendence (Z) of an LCR circuit is given by [tex]Z = \sqrt{R^{2} + (X_{l} - X_{c} )^{2} }[/tex]
Here , [tex]X_{l} =[/tex] reactance and [tex]X_{c} =[/tex] capacitance
At resonance frequency, Z is minimum and current is maximum. For any other value of frequency, the value of current will decrease (when compared to current at resonance).Clearly, the circuit must have inductor and capacitor. However, it may be possible that the circuit also has a resistor besides inductor & capacitor.To know more about circuits visit:
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Question 25 What major factor explains the quick adoption of new programs?O One political party supports the program.O The media draws attention to the particular issue. O The public does not hold a very strong opinion on the issue. O There are many interest groups active on both sides of the policy. O The public holds wide enthusiasm for a program. Question 18 1 p What is an important difference in our current political system compared to when the Constitution was created and ratified?O National leaders were only beholden to their own consciences in the past. O National leaders were more careerist and served in the legislature for several decades in the earlier era. O Politics was much more collegial in the previous era. O There was much more openness and transparency in the previous era.O There was much more accountability in the previous era.
The Major factor explaining the quick adoption of new programs is media draw attention to particular issue.
Our constitution gave our leaders enormous powers and didn't think about how to lead them.
Our Constitution says that 100 sinners may be released, but the innocent should not be punished and blindly obeyed.
Our Constitution contained no rule that the Constitution could be amended or amended only for a limited period of time, but under the strict guidelines of the Constitutional Commission, unlimited amendments were allowed. This provision for the government may prevent the government from doing other work. It also gave some good results.
As you can see in the preface above, “social, economic and political justice. Sometimes, what existed at the economic level is just a giveaway, even for the sake of the name.
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which one of the following statements concerning electromagnetic waves is false? (1.5 points) (a) electromagnetic waves carry energy. (b) x-rays have longer wavelengths than radio waves. (c) in vacuum, all electromagnetic waves travel at the same speed. (d) lower frequency electromagnetic waves can be produced by oscillating circuits. (e) they consist of mutually perpendicular electric and magnetic fields that oscillate perpendicular to the direction of propagation.
The incorrect option is (b) X-rays have longer wavelengths than radio waves
Visible light is the term used to describe radiation at wavelengths that humans can see. Your radio detects radio waves, which have much longer wavelengths than visible light. While visible light has a much longer wavelength than X-rays, the latter have much shorter ones.Radio waves are easygoing and weak. Mist can diffuse them, water can short them out, iron beams or plates can stop them. When they strike humans, they cause only a slight warming, unless kilowatts are directly focused on a body as in a microwave (which uses radio waves). We can communicate with the aid of radio waves, which are our friends.They manage to tear right through many materials, and if they do stop, they tear atoms apart into ions, molecules into fragments, often radicals. They can mutate DNA and have often terrible consequences on progeny if they strike sperm or egg cells. You can use X-rays to image a body’s insides, but you want to be very careful about it.To study more about X rays -
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g a photon with an energy of 8.61 ev is absorbed by a metal that has a work function of 5.75 ev, resulting in the ejection of an electron. what is the maximum kinetic energy of the electron in ev?
The maximum kinetic energy of the electron in ev is 2.86 ev.
We know the relation between energy, work function and maximum kinetic energy as,
E = W + KE max -----(1)
where, E is the energy absorbed
W is the work function
KE max is the maximum kinetic energy
It is also known as photoelectric equation.
Given that,
E = 8.61 ev
W = 5.75 ev
KE max = ?
By substituting the above values in equation (1), we have
8.61 = 5.75 + KE max
KE max = 2.86 ev
Thus, the maximum kinetic energy of the electron in ev is 2.86 ev.
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the law of reflection states that when light rays reflect off a surface the angle of incidence a. is one-half the angle of reflection. c. is twice the angle of reflection. b. equals the angle of reflection. d. equals the angle of refr
The law of reflection states that when light rays reflect off a surface the angle of incidence is equal to the angle of reflection.
The process by which light rays strike a surface and are reflected back is called light reflection.
The laws of reflection is the principle or rule that governs the phenomenon of light reflection.
The law of reflection states that a ray of light will bounce off a surface at the same angle at which it struck it when it comes into contact with it. The angle at which the light ray strikes the surface is known as the angle of incidence and the angle at which the light ray reflects from the surface is known as the angle of reflection. The law can also determine how the light beam will behave.Therefore according to the law of reflection, the angle of incidence is always equal to the angle of reflection.
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