# In photoelectric effect light of certain frequency ( gt  threshold frequency ) is incident on a metal surfave whereby , an e^(-) ( with certain K.

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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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