A photosensitive metal is not emitting photo-electrons when irradiated. It will do so when threshold is crossed. To cross threshold we need to 6. increase

 A photosensitive metal is not emitting photo-electrons when irradiated. It will do so when threshold is crossed. To cross threshold we need to 6. increase

  1. A

     intensity

  2. B

     frequency

  3. C

     wavelength

  4. D

     none of the above

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    Solution:

     When the frequency of incident radiation is increased, then the energy of photon increases. When energy of photons becomes greater than work function W=hv0 then photo-electrons are emitted.

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