First slide

Quantum Theory of Light

Question

A photo cell is illuminated by a small bright source placed one metre away.When the same source of light is placed two metres away, the electron emitted by the photo cathode

Moderate

A

Each carries quarter of its previous energy
B

Each carries quarter of its previous momenta
C

Are half as numerous
D

Are one quarter as numerous

Solution

Light intensity is inversely proportional to square of the distance

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