Photoelectric effect with free electrons.

AI Thread Summary
A gamma ray cannot interact with a free electron via the photoelectric effect because the photoelectric effect requires an electron to transition between energy levels, which free electrons do not possess. The photoelectric effect typically occurs in metals where electrons are bound to atoms and can absorb energy from photons. Since free electrons are not associated with specific energy levels, they do not undergo the necessary transitions. Therefore, the interaction described is not applicable to free electrons. Understanding the limitations of the photoelectric effect is crucial for accurately applying its principles.
Ed Aboud
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Homework Statement



Is it possible for a gamma ray to interact with a free electron by mean of the photoelectric effect?


Homework Equations





The Attempt at a Solution



I'm not really sure. I think the answer is no simply because of the mechanics of the photoelectric effect, i.e the fact that when an electron interacts with a photon it undergoes a transition from one energy level to a higher one which can be described by its work function. And since it is a free electron that we are discussing, it can't undergo a transition from one energy level to a higher one (I think, sorry I'm not well educated on the free electron model).

Am I correct?

Thanks in advance for any help.

Ed
 
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If by 'free electron' it means just an electron somehow in space just floating, then I'd say no.

Photoelectric effect is for metals
 

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