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C) Photon, particle Collision

'Compton Effect'

(2nd proof of photon theory)

- Light acts like particles
in collisions with free electrons.

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x_ray_compton_scattering.avi

Penn State

High frequency source
(like X-Rays) 

	Photon (after)
Photon transferred energy & momentum  to electron

Which color of light has the
greatest momentum?

Violet

Highest f,  Smallest λ

**Mass, energy, momentum
are conserved.