A photocell is illuminated by a small bright source placed 1 m away. When the same source of light is placed 
m away, the number of electrons emitted by photocathode would :
Text Solution
Verified by ExpertsThe correct answer is:
B
Here, we assume light to spread uniformly in all directions.
The number of photo-electrons emitted from a surface depend on the intensity of light I falling on it. Thus the number of electrons emitted n depends directly on I. P remains constant as the source is the same.
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