Photoelectric Effect

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Kaitlyn Jang 1F
Posts: 45
Joined: Sat Aug 17, 2019 12:16 am

Photoelectric Effect

Postby Kaitlyn Jang 1F » Sat Oct 12, 2019 1:01 pm

When subtracting energy removed from energy of a photon, why is the resulting excess energy also equal to kinetic energy of the electron?

Anisha Chandra 1K
Posts: 83
Joined: Thu Jul 11, 2019 12:17 am

Re: Photoelectric Effect

Postby Anisha Chandra 1K » Sat Oct 12, 2019 2:31 pm

When subtracting energy removed from energy of a photon, why is the resulting excess energy also equal to kinetic energy of the electron?

So in the photoelectric effect, if the energy of incoming light is high enough it can remove electrons and the electron is emitted. If the energy of light is higher than the threshold energy, then electrons will be emitted and the excess energy will go with it.

Basically I think the excess energy is used to emit electrons and since the electrons are moving, the excess energy is basically manifested as the kinetic energy of the electron.

chari_maya 3B
Posts: 70
Joined: Sat Sep 07, 2019 12:18 am

Re: Photoelectric Effect

Postby chari_maya 3B » Sat Oct 12, 2019 4:14 pm

If that is true ( if excess energy is used to emit electrons and since the electrons are moving, the excess energy is basically manifested as the kinetic energy of the electron) then what would be the kinetic energy when the threshold energy is met exactly?

Alexandra Bartolome 2H
Posts: 66
Joined: Sat Jul 20, 2019 12:17 am

Re: Photoelectric Effect

Postby Alexandra Bartolome 2H » Sat Oct 12, 2019 5:18 pm

chari_maya 3B wrote:If that is true ( if excess energy is used to emit electrons and since the electrons are moving, the excess energy is basically manifested as the kinetic energy of the electron) then what would be the kinetic energy when the threshold energy is met exactly?


If I am not mistaken, the kinetic energy when the threshold energy is met exactly would be zero. There would be no excess energy due to the law of the conservation of energy.


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