The frequency and the intensity of a beam of light falling on the surface of photo-electric material are 7, increased by a factor of two. This will
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a
increase the maximum kinetic energy of the photo-electrons, as well as photo-electric current by a factor of two
b
increase the maximum kinetic energy of the photo-electrons and would increase the photo-electric current by a factor of two
c
increase the maximum kinetic energy of the photo-electrons by a factor of two and will have no effect on the magnitude of the photoelectric current produced
d
not produce any effect on the kinetic energy of the emitted electrons but will increase the photo-electric current by a factor of two.
answer is B.
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Detailed Solution
12mv2max=hv−W when v is doubled (14/ remains the same), 12mv2max i.e., (K.E.) max is increased. The photo-electric current is directly proportional to the intensity of incident light.