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A photocell is illuminated by a small bright source placed away. When the same source of light is placed away, the number of electrons emitted by photo cathode would:

  1. A
    decrease by a factor of
  2. B
    increase by a factor of
  3. C
    decrease by a factor of
  4. D
    increase by a factor of

Solution & Step-by-step Explanation

The number of photo-electrons emitted per second is proportional to the intensity of incident light.Intensity .When distance is halved ():

Since intensity increases by a factor of 4, the number of emitted electrons also increases by a factor of 4.

Practice this question

Try it yourself before checking the explanation above.

A photocell is illuminated by a small bright source placed away. When the same source of light is placed away, the number of electrons emitted by photo cathode would:
A
decrease by a factor of
B
increase by a factor of
C
decrease by a factor of
D
increase by a factor of

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Modern PhysicsPhotoelectric Effect

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