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.

Question

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. (A) Both A and R are correct and R is the correct explanation of A (B) Both A and R are correct but R is not the correct explanation of A (C) A is correct but R is not correct (D) A is not correct but R is correct

Tardigrade Admin · Accepted Answer

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_{m a x}

if

h v = w_{0}

\Rightarrow K.E._{m a x} = 0

Hence reason

R

, is correct, But

R

is not the correct explanation of

A

.

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

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=w0​+K.Emax​ if hv=w0​ ⇒ K.E. max​=0 Hence reason R, is correct, But R is not the correct explanation of A.

To free the electron from metal surface minimum energy required, is equal to the work function of that metal.
So Assertion $A$ , is correct.
$h v = w_{0} + K . E_{m a x}$
if $h v = w_{0}$
$\Rightarrow K.E._{m a x} = 0$
Hence reason $R$ , is correct, But $R$ is not the correct explanation of $A$ .