Question

5. Electrons ejected from the surface of a
metal, when light of certain frequency is
incident on it, are stopped fully by a
retarding potential of 3 volts. Photo
electric effect in this metallic surface begins
at a frequency 6 x 10145-!. The frequency
of the incident light in s'is [h=6 x 10-34 J-
sec;charge on the electron=1.6x10-1°C]
1) 7.5 x 1013 2)13.5 x 1013
3) 14 x 1014
4) 7.5 x 1015​

Answer 1

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