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Physics - Modern Physics Question with Solution | TestHub

PhysicsModern PhysicsPhotoelectric effectMedium2 minQB

PhysicsMediumsingle choice

A photo cell is illuminated by a small bright source placed 1 m away. When the same source of light is placed 2 m away, the electrons emitted by photo cathode

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Answer:

Solution:

$I \propto \frac{1}{r ^{2}} \frac{I _{2}}{I _{1}} = (\frac{1}{2})^{2} = \frac{1}{4}$

Electron emission rate becomes one-quarter; individual maximum energy is unchanged

Stream:JEESubject:PhysicsTopic:Modern PhysicsSubtopic:Photoelectric effect

⏱ 2mℹ️ Source: QB

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