The Photoelectric Effect
Electricity and Magnetism
Level
1
The collector (anode) plate in an experiment on photoelectric effect is kept vertically above the emitter (cathode) plate. Light source is put on and a saturation photocurrent is recorded. An electric field is switched on that has a vertically downward direction.
The kinetic energy of the electrons will increase.
The stopping potential will decrease.
The threshold wavelength will increase.
The photocurrent will increase.
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1 solution
The kinetic energy of the electrons will increase is the correct choice. There will an upward force acting on the electron, which is in the same direction that the electron is travelling in (from the emitter to the collector). Therefore, the electrons will accelerate and its kinetic energy will increase.