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## Homework Statement

Okay, so here's the problem:

In a Compton scattering experiment, a photon is scattered through an angle of 90.0 and the

electron is set into motion in a direction at an angle of 20.0 to the original direction of the

photon.

(a) Explain how this information is sucient to determine uniquely the wavelength of the

scattered photon.

(b) Find this wavelength.

## Homework Equations

λ2 - λ1 = (h/m c)(1 - Cosθ)

## The Attempt at a Solution

So, with the angle I'm given I can find Δλ, but I won't be able to find λ2 which is what I believe the question is asking me to find. I feel like I should be using the angle of the electron but I don't really see how I can. Can anyone help me out here? :S