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Rutherford's Model of an Atom

A photon of ...

Question

A photon of $6 e V$ is incident on a metal surface and the emitted electron is stopped by a retarding potential of $- 5 e V$ . What is the work function of the metal?

A

1 e V

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B

2.5 e V

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C

3 e V

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D

11 e V

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Solution

The correct option is A $1 e V$
Since, the electron is stopped by $- 5 e V$ . Also, it is known that $K . E = 5 e V$
So the work function of the metal $= 6 e V - 5 e V = 1 e V$

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