The frequency of this radiation of a quantum of energy 4.14 *10-14 J is calculated to be 2.58 *10-15 Hz.
The Photoelectric Effect occurs when electrons are released from a metal surface when light strikes it. It was once thought that the greater the intensity of incoming light, the greater its energy, independent of hue. The light was viewed and treated as a wave, however, the wave phenomenon could not explain light's photoelectric actions.
The Quantum, according to Max Planck, is the smallest unit of energy that is released or absorbed in the form of electromagnetic radiation. The energy released or absorbed is proportional to the frequency of the radiation. It may be expressed mathematically as:
E= hc/λ
or
E= hf ( because, f = c/λ)
where,
E= Energy of the particle
h= Planck's constant
c= speed of light
λ= wavelength of the particle
f = frequency of the radiation
Thus, E= hf
Given,
E = 4,14*10-14J
E= 1.71017356 * 10^20 eV
h= 6.626 *10-34 m2Kg/s
E=hf
f= E/h
f= (1.71017356 * 10^20 eV) / (6.626 *10-34 m2Kg/s)
f= C
Thus, the frequency of this radiation is 6.626 *10-34 m2Kg/s.
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the density of lead is 11.342 g/ml. what would be the volume of a 25.00 g sample of this metal?
The volume of the lead is 2.2 mL
What is density?The term density refers to the ratio of the mass to the volume of a body. We know that from the question, the following are the parameters that we have been given;
Density of lead = 11.342 g/ml
Mass of lead = 25.00 g
Volume of lead = ??
We can write that;
Density = mass/volume
Volume = mass/Density
Volume = 25.00 g/ 11.342 g/ml
= 2.2 mL
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What happens to the potential energy of the molecules in a reaction? A. The reactants only lose potential energy when forming products. B. The potential energy of the molecules changes during a reaction. OC. The potential energy of the molecules does not change in a reaction. D. The potential energy of the products is equal to that of the reactants.
The potential energy of the molecules changes during a reaction.
Potential energy :Potential energy is a form of energy that is stored but is dependent on the relative positions of different system components. Stretching or compressing a shock absorber increases its potential energy. A steel ball has more potential energy when it is raised above the surface of the earth than when it is brought to Earth.
What happens to the potential energy?Potential energy can be transformed into kinetic energy, which is the energy of motion, and then into other forms like electric energy. One of the two types of energy is potential energy, which is the latent energy in an object at rest. Kinetic energy, on the other hand, is the energy that a moving object expresses.
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In your opinion, is a food web or a food chain a more accurate representation of how
energy and matter flow in an ecosystem? Explain.
Pls help I will give brainless
Answer: food webs
Explanation: they are more realistic because they show that the producers are usually eaten by many different consumers and most consumers are eaten by more than one predator. A food web is the natural interconnection of food chains and is generally a graphical representation of what-eats-what in an ecological community.
Directions: Provide the chemical name of the given chemical formula.
Chemical Formula
1. Zn(ClO₂)2
2. Mn3N4
3. Na₂SO4
4. CO(NO3)3
5. K(MnO4)
6. N₂Ss
7. P406
8. HCIO(aq)
9. H₂SO3(aq)
10. H3P(aq)
The names of each of the compounds as shown in the question above;
1. [tex]Zn(ClO_{2} )_{2}[/tex] - Zinc II hypochlorite
2. [tex]Mn_{3} N_{4}[/tex] - Manganese IV nitride
3. [tex]Na_{2} SO_{4}[/tex] - Sodium sulfate
4. [tex]CO(NO_{3} )_{3}[/tex] - Cobalt III nitrate
5. [tex]K(MnO_{4} )[/tex] - Potassium permanganate
6. N₂S - Sodium sulfide
7. [tex]P_{4} O_{6}[/tex] - phosphorus trioxide (dimer)
8. HCIO(aq) - hypochlorous acid
9. [tex]H_{2} SO_{3}[/tex](aq) - Sulfurous acid
10. [tex]H_{3} P[/tex](aq) - phosphine
What is a chemical name?We know that in the field of chemistry, the name of a compound is decided by the International Union of Pure and applied Chemistry. This organization gives the general rules that pertain to the naming of chemical compounds. The name of a compound is derived from the elements that are contained in the compound. Sometimes, the oxidation state of the central atom in the compound is an important part of the naming of the compound.
Let us now write the names of each of the compounds as shown in the question above;
1. [tex]Zn(ClO_{2} )_{2}[/tex] - Zinc II hypochlorite
2. [tex]Mn_{3} N_{4}[/tex] - Manganese IV nitride
3. [tex]Na_{2} SO_{4}[/tex] - Sodium sulfate
4. [tex]CO(NO_{3} )_{3}[/tex] - Cobalt III nitrate
5. [tex]K(MnO_{4} )[/tex] - Potassium permanganate
6. N₂S - Sodium sulfide
7. [tex]P_{4} O_{6}[/tex] - phosphorus trioxide (dimer)
8. HCIO(aq) - hypochlorous acid
9. [tex]H_{2} SO_{3}[/tex](aq) - Sulfurous acid
10. [tex]H_{3} P[/tex](aq) - phosphine
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How many nanometers (nm) are in 2.8 m?
Answer:
2800000000 Nanometers
I would like some assistance on this please
Because it is buoyant, helium floats because its molecules are lighter than those of our atmosphere's nitrogen and oxygen and so they rise above it.
Briefing:The helium balloon moves some air around (just like the empty bottle displaces an amount of water). The balloon will float in the air as long as the combined weight of the helium and balloon fabric is less than the air it replaces. Helium is actually much lighter than air, as it turns out.
Where does helium come from?Two electrons, two protons, and typically two neutrons make up the element helium. It is an inert gas that has no color or smell. Fusion and fission both produce helium as a product. Helium was initially found in the sun's spectrogram in 1868.
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A 45.00-g sample of silver nitrate is mixed with 55.00 g of hydrochloric acid to form a white precipitate of silver chloride. After the solution is filtered and dried, a white precipitate of mass 33.50 g is collected.
a. Determine the limiting reactant.
b. Determine the theoretical yield of silver chloride.
c. Determine the percent yield of silver chloride.
a. The limiting reactant is silver nitrate
b. The theoretical yield of silver chloride is 37.94 grams
c. The percent yield of silver chloride is 88.3%
Stoichiometric problemFirst, let us see the equation of the reaction:
[tex]HCl + AgNO_3 -- > HNO_3 + AgCl[/tex]
The mole ratio of the reactants is 1:1.
Mole of 45 g sample of silver nitrate = 45/170
= 0.2647 moles
Mole of 55 g sample if hydrochloric acid = 55/36.46
= 1.5068 moles
Thus, the limiting reactant is silver nitrate.
Mole ratio of silver nitrate and silver chloride = 1:1.
Equivalent mole of silver chloride = 0.2647 moles
Mass of 0.2647 moles silver chloride = 0.2647 x 143.32
= 37.94 grams
Theoretical yield of silver chloride = 37.94 grams
The percentage yield of silver chloride = 33.5/37.94 x 100
= 88.3%
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