Given below are two statements: one is labelled as Assertio…

Physics Electron, Photon, Photoelectric Effect and X-rays JEE Main 2022 - ( Dual Nature of Matter ) MCQ (Single Correct)

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: The photoelectric effect does not take place, if the energy of the incident radiation is less than the work function of a metal.

Reason R: Kinetic energy of the photoelectrons is zero, if the energy of the incident radiation is equal to the work function of a metal.

In the light of the above statements, choose the most appropriate answer from the options given below.

Both A and R are correct and R is the correct explanation of A

Both A and R are correct but R is not the correct explanation of A

A is correct but R is not correct

A is not correct but R is correct

Text Solution

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The correct answer is:

To free the electron from metal surface minimum energy required, is equal to the work function of that metal.

So, Assertion A, is correct.

hv = w 0 + K. E. max

if hv = w 0

Hence reason R, is correct, But R is not the correct explanation of A.

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