Photoelectric EffectMedium
Question
A cesium photo cell, with a steady potential difference of 60 volt across it, is illuminated by a small bright light placed 50 cm away. When the same light is placed one meter away, the photoelectrons emerging from the photo cell : (assume that potential difference applied is sufficient to produce saturation current)
Options
A.each carry one quarter of their previous energy
B.each carry one quarter of their previous momentum
C.are half as numerous
D.are one quarter as numerous
Solution
As the distance of the source doubles, the photons falling on the photon cell becomes 1/4th. Hence, number of photoelectrons will also become 1/4 th.
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