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

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 takes 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.
 

Option: 1

Both \mathbf{A}$ and $\mathbf{R} are correct and \mathbf{R} is the correct explanation of \mathbf{A}
 


Option: 2

Both \mathbf{A}$ and $\mathbf{R} are correct but \mathbf{R} is not the correct explanation of \mathbf{A}
 


Option: 3

\mathbf{A} is correct but \mathbf{R} is not correct
 


Option: 4

\mathbf{A} is not correct but \mathbf{R} is correct


Answers (1)

best_answer

For the photoelectric effect to take place the incident energy must be greater than or equal to the work function.

and its equation is given as 

\\\mathrm{E=\phi_{\circ }+k E_{\text {max }}}\\

\mathrm{If \; E=\phi_{\circ }, \quad k E=0}

Hence, the correct answer is Option (2)

Posted by

Suraj Bhandari

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