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In photoelectric effect light of certain...

In photoelectric effect light of certain frequency `( gt ` threshold frequency ) is incident on a metal surfave whereby , an `e^(-)` ( with certain K.E.) moves towards the collector plate and a flow of current is initiated . In order to stop the current flow, an opposite potential , on the two metal plates, is applied
A light of frequency `2.5xx 10^(15) Hz` is incident on a metal surface having work function 4 eV. The velocity of photoelectron is ( in cm `s^(-1))`

A

`1.5 xx 10^(6)`

B

`1.5 xx 10^(8)`

C

`2 xx 10^(8)`

D

`2.5 xx 10^(4)`

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