Photoelectric effect can take place only when photons strike bound electrons or electrons embedded in the metal surface, since it is impossible for a photon to give up all its energy and momentum to a free electron. this is in accordance with
a.law of conservation of energy
b.law of conservation of mass
c.law of conservation of momentum
d.law of conservation of both energy and momentum
Answers
This law states that if there is no net forces on a system, it will have the same momentum at all times. If there is no external energy imposed on system it will remain constant. This is also related to Newton's first law. Which says that bodies remain constant when no force is applied onto them.
Thus, a photoelectric effect can only take place when a photons strike the electrons otherwise its not possible for a photon to give up all the energy and momentum to free its electron.
Concept Introduction:
Even under relativistic circumstances, momentum—whether linear or angular—remains constant. Since saving energy is scalar conservation, calculations always need to take the total amount of energy into account. A vector is a momentum. As a result, directional conservation is assumed to apply to momentum.
Explanation:
We have been given a multiple-choice question.
We have to find the correct option.
According to this rule, a system will all have the same momentum if there are no net forces acting on it. If no outside energy is applied to the system, it will stay constant. Additionally connected to Newton's first law is this. which asserts this because when no force is exerted on a body, it stays the same. Therefore, photon energy can only occur when photons collide with electrons; otherwise, a photon cannot release its electron with enough energy and momentum.
Final Answer:
The final answer is the law of conservation of both energy and momentum.
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