- #1

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## Homework Statement

A 0.7MeV (E°) photon scatters off a free electron such that the scattering angle of the photon is twice the scattering angle of the electron (θ=2φ). Determine the scattering angle for the electron.

## Homework Equations

λ' - λ° = h/(m

_{e}c)(1-cosθ)

E = hc/λ

ρ

_{electron}= m

_{e}v / √(1-v

^{2}/c

^{2})

## The Attempt at a Solution

The initial wavelength of the photon (λ°) = hc/E° = 5.92x10

^{-13}m

Honestly, I'm not sure at all where to go from here. I know it's a conservation of momentum problem, but based on the equation above, I need the velocity of the electron in order to find it's momentum.