Questions
Light of frequency 1.5 times the threeshold frequency is incident on a photosensitive material. What will be the photoelectric current if the frequency is halved and intensity is doubled ?
detailed solution
Correct option is C
The ejection of phototelectrons depends on the full energy transfer by the impinging photon provided by the fact that the photon energy is sufficient enough to clear the work function at least. If the frequency is reduced then the transferred energy will not be enough to liberate the electron irrespective of the intensity of the incident beam.Talk to our academic expert!
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A photo cell is illuminated by a small bright source placed at 1m away. When the same source of light is placed 2m away, which of the following is true about the electrons emitted by the photo cathode?
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