Zinc has work function (Φ) of 4.3 eV. The longest wavelength of the light is 2.885nm.
What is work function?In solid-state physics, work function (sometimes spelled work function) is the minimum thermodynamic work (i.e., energy) needed to remove an electron from a solid to a point in the vacuum immediately outside the solid surface. Here "immediately" means that the final electron position is far from the surface on atomic scale, but still too close to the solid to be influenced by ambient electric fields in the vacuum.
The work function is not a characteristic of a bulk material, but rather a property of the surface of material (depending on crystal face and contamination).
The work function refers to removal of an electron to a position that is far enough from the surface (many nm) that the force between electron and its image charge in the surface can be neglected. The electron must also be close to the surface compared to the nearest edge of a crystal facet, or to any other change in surface structure, such as a change in material composition, surface coating or reconstruction. The built-in electric field that results from these structures, and any other ambient electric field present in vacuum, are excluded in defining the work function.
From the question we are told that,
The work function of Zinc is [tex]W=4.3eV[/tex]
Generally, work function can be mathematically represented as
[tex]E_{o} = \frac{hc}{ λ long}[/tex]
⇒[tex]λ long=\frac{hc}{E_{o} }[/tex]
Here h is Planck constant with the value h= [tex]4.1357*10^{-15} eV[/tex]*
and c is the speed of the light with value c= [tex]3.0*10^{8}m/s[/tex]
So,
⇒λ[tex]_{long}[/tex] = [tex]\frac{4.1357*10^{-15}*3*10^{8} }{4.3}[/tex]
= [tex]2.885*10^{-7}[/tex]m
= 2.885nm
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Question
Why do cell organelles have specialized functions?
So all cells can conduct photosynthesis
So all cells can conduct photosynthesis,
To make movement differ throughout a cell's life cycle
To make movement differ throughout a cell's life cycle,
To help a cell perform different cell activities
To help a cell perform different cell activities,
To dissolve the cell when it dies
The cell organelles have specialized functions in order to help a cell perform different cell activities (Option 3 is correct).
What are cell organelles?The cell organelles are membrane-bound structures inside eukaryotic cells that help them to perform specialized functions such as protein synthesis (ribosomes), photosynthesis (chloroplasts), lipid processing (RE and Golgi), enzymatic degradation (lysosomes), etc.
In conclusion, the cell organelles have specialized functions in order to help a cell perform different cell activities (Option 3 is correct).
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Can someone explain me how to solution this question.
There will be phase changes due to which bottle will break at the end.
Many substances have the ability to alter their phase without changing their chemical makeup. The example of water is familiar. The density of the substance is altered during a phase transition. The density unit of grams per cubic centimetre is an illustration. The solid phase will typically be denser than the liquid phase. The material sample will therefore take up less space in the solid phase than it does in the liquid phase.The water now freezes, causing a phase change that results in the formation of solid water (ice). Solid water has a different density than liquid water. The fact that solid water has a lower density than liquid water is a crucial characteristic.We will use this information to calculate the volume of solid water.
mass of water inside the bottle = 242g
Volume of solid water = 242 × mL/ 0.916 g
= 265 mL
This calculated volume of solid water (ice) is greater than the glass bottle's 250 mL capacity. Therefore, bottle will crack.
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A heliox deep-sea diving mixture contains 3.6g of oxygen to every 96.4g of helium. WHat is the partial pressure of oxygen when this mixture is delivered at a total pressure of 8.4 bar?
The partial pressure of oxygen gas when this mixture is delivered at a total pressure of 8.4 bar is 0.0039 bar.
What is the partial pressure of oxygen gas in the mixture?The partial pressure of oxygen gas in the Heliox deep-sea diving mixture that contains 3.6g of oxygen to every 96.4g of helium is calculated as follows:
Moles of oxygen gas = mass/molar mass
mass of oxygen gas = 3.6 g
molar mass of oxygen gas = 32.0 g
moles of oxygen gas = 3.6/32
moles of oxygen gas = 0.1125 moles
Moles of helium gas = mass/molar mass
mass of helium gas = 96.4 g
molar mass of helium gas = 4.0 g
moles of helium gas = 96.4/4
moles of helium gas = 24.1 moles
Total moles of gases = 24.1 + 0.1125
Total moles of gases = 24.2125
Partial pressure of oxygen gas = mole fraction of oxygen gas * total pressurePartial pressure of oxygen gas = 0.1125/24.2125 * 8.4 bar
Partial pressure of oxygen gas = 0.0039 bar
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express the number 0.000114 in scientific notation
Answer:1.14 10x^-4
Explanation:
Calculate the number of atoms of 13.555 g Pt
Answer:
4.1843 x 10²² atoms Pt
Explanation:
To find the number of platinum (Pt) atoms, you need to (1) convert grams to moles (using the atomic mass) and then (2) convert moles to atoms (using Avogadro's number). It is important to arrange the conversions in a way that allows for the cancellation of units. The final answer should have 5 sig figs to match the amount of sig figs in the given value (13.555).
(Step 1)
Atomic Mass (Pt): 195.08 g/mol
13.555 grams Pt 1 mole
--------------------------- x ------------------------- = 0.069484 moles Pt
195.08 grams
(Step 2)
Avogadro's Number:
6.022 x 10²³ atoms = 1 mole
0.069484 moles Pt 6.022 x 10²³ atoms
--------------------------------- x --------------------------------- = 4.1843 x 10²² atoms Pt
1 mole
Nonrenewable Resouces
Answer:there are four types they are oil,natural gas,coal, and nuclear energy
Explanation:
C.E.R.: How Could the continents moved apart?
As the seafloor grows wider, the continents on opposite sides of the ridge move away from each other.
What is the oxidation number of N in NH4HCO3?
Answer:
For numerical purposes however, we can assume that each nitrogen is in +1 and overall oxidation... The oxidation of nitrogen in NH4+ is -3. The hydrogen atoms have +1 and there are four of them. And net charge on the molecule is +1.
Explanation:
Use the data in the table below to answer the following questions. The true value for this data set is 5.68g.
1) The student which is neither precise nor accurate is student B
2) The student which is most accurate on any single trial is student A
3) The student that is both precise and accurate is student C
4) The student which is precise but not accurate is student D
What is precision and accuracy?The term precision has to do with the fact that the values of the measurement are close together. Precise values do not scatter a lot. They vary within a narrow range.
An accurate measurement is one that is close to the true value. This means that it does not differ so much from the true value of the measurement.
Hence;
1) The student which is neither precise nor accurate is student B
2) The student which is most accurate on any single trial is student A
3) The student that is both precise and accurate is student C
4) The student which is precise but not accurate is student D
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A student states that natural resources could be saved if people made everything they need in labs. What is the main problem with this idea?(1 point)
The materials made in labs will still pollute the environment and destroy natural resources.
Anything made in the lab requires natural resources to produce it.
There are not enough synthetic resources yet to make what people need.
People might think it is fine to waste a lot of the materials since they just came from a lab.
Anything made in the lab requires natural resources to produce it is the main problem with this idea.
The correct option is B.
What are some examples and resources?Anything that helps you live better and is practical is a resource. A "Resource" is any part of the natural world that is beneficial to humans, including things like oxygen, water, foods, plants, creatures, minerals, and metals.
What are the top ten natural resources?Stone, sand, metals, oil, coal, and natural gas are examples of natural resources. Other natural resources include things like air, sunlight, soil, and water. Natural resources include things like plants, fish, birds, and animals. The production of food, energy, and raw materials for the manufacture of commodities all depends on natural resources.
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The complete question is -
A student states that natural resources could be saved if people made everything they need in labs. What is the main problem with this idea?(1 point)
a-The materials made in labs will still pollute the environment and destroy natural resources.
b-Anything made in the lab requires natural resources to produce it.
c-There are not enough synthetic resources yet to make what people need.
d-People might think it is fine to waste a lot of the materials since they just came from a lab.
Given the following thermochemical equation detailing the combustion of glucose
C6H12O6(s) +602(g) → CO₂(g) + 6H₂O(g) AHxn=-2803 kJ/mol C6H12O6
determine the amount of glucose needed to release 30 kJ of energy.
1.93g of glucose is required to produce 30KJ of energy
One of the carbohydrates referred to as simple sugars is glucose, commonly known as dextrose (monosaccharides). The chemical formula for glucose is C6H12O6, which means "sweet" in Greek. It is the main free sugar present in higher animals' blood and can be found in fruits and honey. It is the source of energy for cellular activity, hence controlling its metabolism is crucial (see fermentation; gluconeogenesis).
Starch molecules, which make up the majority of plant's energy reserves, are made up of countless linear glucose units. Cellulose is a significant molecule made primarily of glucose and is likewise linear. D-glucose is a chemical found in dextrose. Glycogen, the reserve carbohydrate found in the majority of vertebrate and invertebrate animal cells as well as those of countless fungi and protozoans, is a similar molecule in mammals.
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Which property could be used to separate a mixture of salt and water?
A. boiling point
B. mass
C. electrical conductivity
D. magnetism
Answer:
boiling points
Salt water: Salt can be separated from the water by boiling, taking advantage of the different boiling points of the two substances.
If particles are not created or destroyed, what must be true?
Answer:
that they are neither created or destroyed
how can you demonstrate that iodine can melt to form a liquid at atmospheric pressure
By monitoring the temperature at just above the iodine melting point and observing the melt, it is possible to get liquid iodine at atmospheric pressure.
What happens to iodine when it melts?Iodine is a chemical element that has the symbol I and atomic number 53. If the temperature is 113.7 oC or higher, liquid iodine will be present at the bottom, though, as Mike points out, it may be challenging to see it through the intensely colored iodine vapour. The heaviest of the stable halogens, it is a semi-lustrous, non-metallic solid under normal conditions. It melts at 114 °C (237 °F) to form a deep violet liquid and boils at 184 °C (363 °F) to form a violet gas.
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What is Structural isomers
When is water in a living part of the environment and when is it in a non-living part?
Answer:
Down >3
Explanation:
The nonliving processes such as evaporation, precipitation, etc... water returns back into the atmosphere.Explanation:Water moves through the help of living organisms in an ecosystem. Although, the non-livings processes are also the main partners of this process.Plants absorbs water through their root system and loss by transpiration. Watere also moves through the living organisms in an ecosystem. Other nonliving processes such as evaporation, precipitation, water returns back into the atmosphere!
Sorry For Miss Spelling >3
How many valence electrons are in Bi³+?
PLEASE HELP "4s2 is the amount of energy in the atom"
Using the terms energy level, sub level, and number of electrons explain WHY this misconception is incorrect and what "4", "s" and "2" represent in electron configurations.
The two electrons are found in the N shell of the atom and in a spherically symmetrical orbital.
What is electron configurations?The electron configuration refers to the manner in which electrons are arranged in an atom. The electron in an atom are arranged in shells and subshells. The shells are shown by the principal quantum number which the subshells are shown by the orbital quantum number.
The orbital where the electron is found has a direct corroboration to the energy of the electron. The more radially outwards from the nucleus the orbital is as evidenced by the orbital quantum number, the higher the energy of the electron.
Now the designation"4s^2" implies that the two electrons are found in the N shell of the atom and in a spherically symmetrical orbital.
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which information did milikan contribute to the understanding of electrons
Answer:
He figured out the amount of charge on an electron
Explanation:
Answer:
the accurate determination of the charge carried by an electron, using the e “falling-drop method”; he also proved that this quantity was a constant for all electrons, thus demonstrating the atomic structure of electricity.
Explanation:
if a system does not change its volume during the course of a process, does it do pressure-volume work?
There would be no volume pressure work done.
Is work done?Let us recall that work done in a pressure-volume work is the product of the pressure and the change in the volume of the gas. We know that we can write this as;
W = PΔV
P = pressure
V = volume
We can see that is the volume change is zero because the pressure does not change in the process, then it follows that the work done is zero.
When we say that something is constant, it means that such a thing does not change. In this case, we have been told that the volume does not change so it is constant. If we have agreed that the volume is constant end we could also agree that ΔV =0 and the volume does not change.
Hence, if a system does not change its volume during the course of a process, it does not do a pressure-volume work.
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It is known that oxygen-16 reacts with magnesium metal. Oxygen-18 will also react with magnesium T or F
Which family is most often used to conduct electricity?
O halogens
alkali metals
transition metals
noble gases
Transition Metals is more often used to conduct electricity. Transition metals have free electrons in outer energy levels because d-orbitals shields poorly. That's why transition metals are good conductor of heat and electricity.
Do transition metals conduct electricity?Transition metals are similar to main group metals in many ways, including their metallic appearance, malleability and ductility, ability to conduct heat and electricity, and ability to form positive ions.
Why do they go by the name transition metals?In the periodic table, transition metals are found between s-block and p-block elements. D-block elements is the name given to them. A family of metals that display instability and transitional behavior between s block and p block elements are referred to as "transition metals."
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An antacid contains 200 mg of aluminum hydroxide.
A. How many moles of Al(OH)3 does each capsule contain?
B. How many µg of oxygen does each capsule contain?
A. The number of mole of Al(OH)₃ in the capsule is 0.0026 mole
B. The mass (in µg) of oxygen in the capsule is 124800 µg
Description of moleThe mole of a substance is related to it's mass and molar mass according to the following equation:
Mole = mass / molar mass
A. How to determine the mole of Al(OH)₃From the question given above, the following data were obtained:
Mass of Al(OH)₃ = 200 mg = 200 / 1000 = 0.2 gMolar mass of Al(OH)₃ = 27 + 3(16 + 1) = 78 g/mol Mole of Al(OH)₃ =?Mole = mass / molar mass
Mole of Al(OH)₃ = 0.2 / 78
Mole of Al(OH)₃ = 0.0026 mole
B. How to determine the mass (in µg) of oxygen1 mole of Al(OH)₃ contains 48 g of oxygen.
Therefore,
0.0026 mole of Al(OH)₃ will contain = (0.0026 mole × 48 g) / 1 mole = 0.1248 g of oxygen
Divide by 1000000 to express in µg
Mass of oxygen = 0.1248 / 1000000
Mass of oxygen = 124800 µg
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A student was instructed to measure 30 mL of water in a 50-mL beaker. She recorded the following data in her notebook:
Mass of water 30.0 g
Density of water at Room Temperature 0.997 g/mL
Calculate the student's absolute error.
The student's absolute error, given the data from the question is 0.09 mL
How to determine the volume the student measuredWe'll begin by obtainig the volume of the water the student measured. This can be obtained as follow:
Mass of water = 30.0 gDensity of water = 0.997 g/mLVolume of water =?Density = mass / volume
Thus,
Volume = mass / density
Volume of water = 30 / 0.997
Volume of water = 30.09 mL
How to determine the absolute errorThe absolute error can be obatined as illustrated below:
Accepetd value = 30 mLMeasured value = 30.09 mLAbsolute error =?Absolute error = Measured value - accepted value
Absolute error = 30.09 - 30
Absolute error = 0.09 mL
Thue, the student's absolute error is 0.09 mL
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What is the frequency of a photon of yellow light with a wavelength of 4.63 X 10-7m?
The frequency of a photon of yellow light with a wavelength of 4.63 X 10-⁷m is 6.48 × 10¹⁴ Hz.
How to calculate frequency?The frequency of a wave can be calculated by using the following formula:
v = fλ
Where;
v = velocity (m/s)f = frequency (Hz)λ = wavelength (m)According to this question, a photon of yellow light with a wavelength of 4.63 X 10-⁷m is given. The frequency of this photon can be calculated as follows:
f = 3 × 10⁸m/s ÷ 4.63 X 10-⁷m
f = 6.48 × 10¹⁴ Hz
Therefore, the frequency of a photon of yellow light with a wavelength of 4.63 X 10-⁷m is 6.48 × 10¹⁴ Hz.
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Calculate the energy for the transition of an electron from the n = 3 level to the n = 2 level of a hydrogen atom.
For hydrogen atoms, the energy difference for the electron transition from n = 3 to n = 2 is 0.326x[tex]10^{-18}[/tex] J.
What is electron transition?Electromagnetic radiation's emission or absorption, atoms and molecules undergo electronic transitions (typically UV or visible).
Planck's equation, E = h, relates the energy change connected to a transition to the frequency of the electromagnetic wave.
The energy of the photon is precisely the energy that is lost when an electron moves to a level with less energy.
The photons released when the electron shifts from n=3 or above to n=2 fall in the Visible Light part of the spectrum. These passages are known as Balmer's Series.
[tex]E_{J}[/tex] = 2.179 x [tex]10^{-18}[/tex] ([tex]\frac{1}{3^{2} }[/tex] -[tex]\frac{1}{2^{2} }[/tex])
= 0.326x[tex]10^{-18}[/tex] J
Thus, For hydrogen atoms, the energy difference for the electron transition from n = 3 to n = 2 is 0.326x[tex]10^{-18}[/tex] J.
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A sample is found to contain 6.96×1011 g of salt. Express this quantity in kilograms.
kg
The sample of salt found to contain 6.96 × 10¹¹ grams is equivalent to 6.96 × 10⁸ kilograms.
How to convert grams to kilograms?Kilograms is the International System of Units (S.I unit) or base unit of mass while grams is a unit of mass equal to one-thousandth of a kilogram.
Grams as a unit of mass can be converted to kilograms as follows:
1 kilograms = 1000 grams
According to this question, a sample is found to contain 6.96 × 10¹¹ grams of salt. This unit can be converted to kilograms as follows:
6.96 × 10¹¹ ÷ 1 × 10³
= 6.96 × 10⁸ kilograms
Therefore, the sample of salt found to contain 6.96 × 10¹¹ grams is equivalent to 6.96 × 10⁸ kilograms.
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How many atoms are in 1.50 mol of carbon-12? How many grams does this much carbon-12 weigh
The number of atoms that are in 1.50 mol of carbon-12 is 18g.
1 mol of any substance contains 6.022×1023 atoms/molecules
So 1.50 moles of carbon will have 1.50×6.022×1023 atom = 9.0×1023 atoms
Now, number of moles = weight g /molar mass gmol-1
1.5= weight g/ 12 gmol-1.
So weight = 1.5 mol×12gmol-1 = 18 g
Mole is the unit for the measurement of quantity of a substance.The number of moles is used a unit of measure large number of atoms and the other components.Mole is the standard unit for amount of substance.The elementary numbers of a certain substance are present in a substance or sample is determined by the quantity of that material.To learn more about moles visit:
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a chart which list all of the known elements are?
Answer:
The chart is called the Periodic Table.
Hope this helps :)
Convert: 28.3 micrograms to pounds.
28.3 micrograms equal to 6.2390820e⁻⁸ pounds.
A microgram is a unit of mass. 1 microgram is equal to one-millionth of a gram.
1 mcg = 0 lb
The pound is used in the imperial system for mass measurement.
1lb = 453592370 mcg
The SI or base unit for mass is the kilogram.
1 kg is equal to 1000000000 micrograms, or 2.2046226218488 pounds.
The conversion formula from micrograms to pound is:-
Pound (lb) = micrograms (mcg) ÷ 453592370
We have to convert 28.3 micrograms to pounds.
Dividing 28.3 with 453592370, we get
28.3 ÷ 453592370 = 6.2390820e⁻⁸ pounds
Therefore, 28.3 micrograms equal 6.2390820e⁻⁸ pounds.
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