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So a compton scattering happens and the energy is 45 keV and I need to find the wavelength of the photon incident to this electron. I think I need to use

Lambda = h/mc (1-Cos), but I am not given an angle.

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- Thread starter Jacob87411
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- #1

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So a compton scattering happens and the energy is 45 keV and I need to find the wavelength of the photon incident to this electron. I think I need to use

Lambda = h/mc (1-Cos), but I am not given an angle.

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OlderDan

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Jacob87411 said:

So a compton scattering happens and the energy is 45 keV and I need to find the wavelength of the photon incident to this electron. I think I need to use

Lambda = h/mc (1-Cos), but I am not given an angle.

Maximum energy corresponds to (minimum/maximum, you decide) wavelength change? Which angle gives the (minimum/maximum) wavelength change?

Your equation is missing something. It is not quite correct in two places. For one, the angle for the cos is missing. What else?

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jtbell

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The cue ball will go in reverse fro mthe way it came?

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OlderDan

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Jacob87411 said:The cue ball will go in reverse fro mthe way it came?

Yes, although in the case of a cue ball that has no backspin there is no rebound because the masses of the balls are the same. But if you had a cue ball of lesser mass, it would bounce back. And if you had a cue ball of greater mass, it would keep going forward in a stratight line when the maximum energy is transferred.

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jtbell

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I should have specified something like a ping-pong ball hitting the eight-ball. After all, the photon is massless.

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OlderDan

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Jacob87411 said:

There will be a rebound in the Compton effect problem, and the angle that will give the electron greatest energy is when the rebound photon is straight back.

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