Question

A radiation of wave length 2500 is incident on a metal plate whose work function is 3.5 eV. Then the potential required to stop the fastest photo electrons emitted by the surface is :
 (Js and m/s)

A

2.94 V

B

1.47 V

C

3.5 V

D

4.9 V

Medium
Solution
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Correct option is B)

Energy of photon
Given:






Work function of metal is .

So maximum kinetic energy of the photoelectron after emission
So the voltage required to stop the fastest photoelectron is .
So, the answer is option (B).

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