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Q.

The threshold frequency for a certain metal is v0  When light of frequency v = 2 v0 is incident on it, the maximum velocity of photo electrons is 4 x 106 m/s' If the frequency of incident radiation is increased to 5 v0, then the maximum velocity of photo electrons in m/s will be

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a

(4/5)×106

b

2 x106

c

8 x 106

d

2 x 107

answer is C.

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Detailed Solution

12mv12=2hv0−hv0=hv0 12mv22=5hv0−hv0=4hv0 ∴ 12mv22=412mv12  or  v2=2v1 or v2=2×4×106=8×106m/s
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