Question

Assertion: In the process of photoelectric emission, all the emitted photoelectrons have the same kinetic energy.
Reason: The photon transfers its whole energy to the electron of the atom in photoelectric effect.
A. Both assertion and reason are correct and reason is the correct explanation for assertion.
B. Both assertion and reason are correct but reason is not the correct explanation for assertion.
C. Assertion is correct but Reason is incorrect.
D. Assertion is incorrect but the reason is correct.
E. Both assertion and reason are incorrect.

Answer 1

Hint: For solving this question we have to understand the total concept of photoelectric emission because if we do not know what photoelectric effect is we will not be able to solve this question. Photoelectric effect is defined as the emission of electrons when electromagnetic radiation, such as light, hits a material and these electrons are called photoelectrons.

Complete step by step solution:
From the definition of the photoelectric effect we can understand that the process of photoelectric emission has some kinetic energy but this kinetic energy is observed on the metal surface and inside the metal the energy becomes low since that energy is lost by collision with other atoms in the metal. So, all the emitted photoelectrons do not possess the same kinetic energy, which means the assertion here is incorrect.

Now, let us talk about the reason. The reason is that the photon transfers its whole energy to the electron of the atom in photoelectric effect which is true. This means the assertion is incorrect and the reason is correct.

Hence, the correct answer is option D.

Note: Photoelectric effect is a well known effect when it comes to explain photo emission. When there is light incident on a metal surface that metal surface emits photoelectrons which are also known as photons.