First slide

Photo Electric Effect

Question

All electrons ejected from a surface by incident light of wavelength 200nm can be stopped before travelling 1m in the direction of uniform electric field of 4N/C. The work function of the surface is

Easy

A

4 eV
B

6.2 eV
C

2 eV
D

2.2 eV

Solution

Work done by electric field = eEx
= e x 4 x 1 = 4eV
Energy photon $\frac{124000}{20000} = 6 .2 ev$
hv = W + eVs
6.2 = W + 4
W = 2.2 eV

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