Question

58
1 point
When photon of energy 7eV is made incident
on a metal then the emitted electron is stopped
by / stopping potential of -5.5 V. The work
function of metal will be
1. 13 eV
2. 1.5 en
3 12.5 eV
4. 37.5
​

Answer 1

Answer:

Correct option is

B

1.5eV

The stopping potential (V

s

) related to the incident light energy (E) by the following relation:

eV

s

=E−ϕ.

So, the work-function is given by:

ϕ=E−eV

s

=(7−5.5)=1.5eV

So, the answer is option (B).