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

Pick an option to check your answer.

Verified Solution

Answer & Solution

Correct Answer

(B) Both \(A\) and \(R\) are correct but \(R\) is not the correct explanation of \(A\)

Detailed explanation

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

So Assertion \(A\), is correct.

\(h v = w _{0}+ K. E. _{\max }\)

if \(h v = w _{0}\)

\(\Rightarrow\) \(K.E.\) \(_{\text {max }}=0\)

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

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