Question

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

A

The photocurrent will increase

B

The kinetic energy of the electrons will increase

C

The stopping potential will decrease

D

The threshold wavelength will increase

Medium
Updated on : 2022-09-05
Solution
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Correct option is B)

Force on a electron in  a electric field is given by:
So, if an electric field is switched on which has a vertically downward direction then the kinetic energy of the electrons will increase and will reach the collector plate in an experiment on photoelectric effect is kept vertically above the emitter plate.
So, the answer is option (B).

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