Hey, I'm stuck on part of the calculation for the compton wavelength. Basically, my notes go:(adsbygoogle = window.adsbygoogle || []).push({});

Energy of Electron

Before collision: E_{0}= m_{e}c^{2}

After collision: E_{e}= [tex]\sqrt{P_{e}^{2}c^{2} + m_{e}^{2}c^{4}}[/tex]

Notes:

P_{e}= momentum of electron after collision

E_{e}= energy of electron after collision

m_{e}= mass of electron

I can't see why this follows as the energy after the collision. Any ideas?

Cheers,

Andrew

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# Squaring the energy

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