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Q.

When a certain photo-sensitive surface is illuminated with monochromatic light of frequency v, the stopping potential for photo-electric current is V0 / 2When the same surface is illuminated by mono-chromatic light of frequency v / 2, the stoppingpotential is V0. The threshold frequency for photoelectric emission is

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a

3v/2

b

3v/5

c

5v/3

d

7v/3

answer is A.

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Detailed Solution

we know that h v =v0 +e VFor frequency v, we havehv=hv0+eV0/2FOR frequency v/2 we havehv/2=hv0+eV0Solving egs. (1) and (2) . we get v0=3v/2
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