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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

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The photo current will increase

The kinetic energy of the electrons wiil increase

The stopping potential will decrease

The threshold wavelength will increase

answer is B.

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Detailed Solution

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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