Question

Choose the most correct statement about the kinetic energy of electrons ejected by a metal exhibiting...

Choose the most correct statement about the kinetic energy of electrons ejected by a metal exhibiting the photoelectric effect.

It is the energy of the photon that caused the ejection.
It is the energy of the photon minus the work function for the metal.
It is an energy level proportional to the work function for that metal.
None of the above.
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Answer #1

Most Correct statement about kinetic energy of electrons ejected by metal exhibiting the photoelectric effect is

It is energy of photon minus the workfunction of metal.

In photoelectric effect energy of photon is hv which is incident on metal having threshold frequency(minium frequency required to eject electron from metal). If incident photon has higher frequency than threshold frequency then electrons are ejected with some kinetic energy. Work function is amount of energy holding electrons to metal surface.

Energy of incident photon= Work function of metal + kinetic energy of electrons.

From here we conclude that Kinetic energy = Energy of photon - Workfunction of metal.

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