Solar panels work by the photoelectric Effect. The ejected electrons are collect

Question

Solar panels work by the photoelectric Effect. The ejected electrons are collected into a current. If we shine light at a solar panel, then...

A) electrons will be ejected regardless of the frequence or wavelength of light

B) electrons will be ejected with greater kinetic energy when l increase the beams intensity.

C) no electrons will be ejected if the requency of light is too low

D) the number of electrons ejected wont change if l increase the intesity of light

E) all electrons ejected will move at the speed of light

Explanation / Answer

The correct answer is C)

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explanation:

a) The ejection of electrons depend on the wavelength/frequency of the light. lower the wavelength higher is the chance of electrons getting ejected. Similarly higher the frequency, higher will be the chance of electrons getting ejected. The energy supplied needs to be more than the work function of the metal. so option a) is incorrect.

b) the ejection doesnot depend on the beam intemsity. so the kinetic energy doesnot get affected by the beam intensity. By increasing beam intensity the number of electrons getting ejected increases.

c) Correct as explained in a)

d) false.

e) false. the speed of electrons depend upon the frequency of the light. higher the frequency, higher will be the speed of ejected electrons

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