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

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

  1. A

     increase the maximum kinetic energy of the photo-electrons, as well as photo-electric current by a factor of two

  2. B

     increase the maximum kinetic energy of the photo-electrons and would increase the photo-electric current by a factor of two

  3. 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

  4. 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.

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    Solution:

    12mv2max=hvW 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.

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