Question

How much negative potential should be applied to the plate in photo electric effect
experiment to completely stop the electrons emitted with maximum kinetic energy
of 10 eV?​

Answer 1

Given info : A negative potential is applied to the plate in photo electric effect experiment to completely stop the electrons emitted with maximum kinetic energy.

To find : the negative potential should be...

solution : maximum kinetic energy of ejected electrons, K.E_max = eV₀

where V₀ is the potential that should be applied to the plate to completely stop the electrons.

so, 10eV = eV₀ ⇒V₀ = 10 volts

therefore the negative potential should be -10 volts.

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