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Photo electrons are emitted with a maxim...

Photo electrons are emitted with a maximum speed of `7 xx 10^5 ms^-1` from a surface when light of frequency `8 xx 10^14 Hz` is incident on it, the threshold frequency for this surface is

A

`2.32 xx 10^14 Hz`

B

`4.64 xx 10^14 Hz`

C

`4.64 xx 10^20 Hz`

D

4.64 Hz.

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