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The collector plate in an experiment on ...

The collector plate in an experiment on photoelectric effect is kept vertically above the emitter plate . Light source is put on and a saturation photo current is recorded . An electric field is switched on which has a vertically downward direction . Then

A

The photo current will increase

B

The kinetic energy of the electrons will increase

C

The stopping potential will decrease

D

The threshold wavelength will increase

Text Solution

Verified by Experts

The correct Answer is:
B
In electric field photoelectron will experience force and accelerate opposite to the field so its `K.E.` increases (i.e., stopping potential will increase), no change in photoelectric current , and threshold wavelength .
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