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Threshold frequency for a certain metal is `v_0`. When light of frequency `2v_0` is incident on it, the maximum velocity of photoelectrons is `4xx10^8 cm s^-1`. If frequency of incident radiation is increased to `5v_0`, then the maximum velocity of photoelectrons, in cm `s^-1`, will be

A

`4//5 xx 10^(6)`

B

`2 xx 10^(6)`

C

`8 xx 10^(6)`

D

`2 xx 10^(7)`

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