Radiation of two photon energies twice and five times the work-function of metal are incident successively on the metal surface. The ratio of the maximum velocity of photo electrons emitted in the two cases will be
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a
1 :2
b
2 :1
c
1 :4
d
4 :1
answer is A.
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Detailed Solution
Here we have2W0−W0=12mv12and 5W0−W0=12mv22Dividing eq .(1) by eq . (2) we get2W0−W05W0−W0=v12v22 or v1v2=12