Calculate the change in wavelength of a photon after Compton scattering off an electron. This effect demonstrates the particle nature of light and provides evidence for photon momentum.
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Angle between incident and scattered photon
Wavelength of the incoming photon
How this calculator works
Wavelength shift equals Planck's constant divided by electron rest mass times speed of light, times one minus cosine of the scattering angle.
Common questions about this calculator
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