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  4. 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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Q. 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

VITEEEVITEEE 2010

Solution:

In electric field photoelectron will experience force and accelerate opposite to the field so its $KE$ increases (ie, stopping potential will increase), no change in photoelectric current, and threshold wavelength.

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