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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 electron will be (m is the
electron mass) . [NEET 2013]

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a

hv(2m)

b

hvm

c

2hvm

d

2hvm

answer is C.

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Detailed Solution

As,  (KE)max=12mvmax2=hv⇒vmax2=2hvm

∴  vmax=2hvm

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