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Q.

For photoelectric emission from certain metal the cut-off frequency is ν. If radiation of frequency 2ν impinges on the metal plate, the maximum possible velocity of the emitted will be (m is the electron mass)

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a

hνm2

b

hν2m

c

hνm

d

2hνm

answer is C.

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Detailed Solution

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KE=E-ϕ

12mv2max=h2ν-hν

vmax=2hνm

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