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For photoelectric emission from certain ...

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

A

`2sqrt(hv//m)`

B

`2sqrt(hv//(2m))`

C

`sqrt(hv//m)`

D

`sqrt(2hv//m)`

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