General Q about photoelectric effect terms  [ENDORSED]

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Lindsay H 2B
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General Q about photoelectric effect terms

Postby Lindsay H 2B » Sun Oct 15, 2017 4:29 pm

When a question asks "how much energy is required to remove an electron from a metal surface?" is it asking us to find the threshold energy or the energy of the photon?

Chris Pleman 3E
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Re: General Q about photoelectric effect terms  [ENDORSED]

Postby Chris Pleman 3E » Sun Oct 15, 2017 4:39 pm

Threshold energy, unless specified otherwise.

Jessica Beroukhim 3K
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Re: General Q about photoelectric effect terms

Postby Jessica Beroukhim 3K » Mon Oct 16, 2017 12:33 am

To build on that, the energy of the photon is how much energy goes into system, but it can be more or less (or the same) as thee threshold energy. It's unrelated. But if you're given the kinetic energy or velocity of the electron afterwards, you can use that and the threshold energy to find the energy of the photon.


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