3.I.10A

What are the momentum and energy of a photon of wavelength $\lambda$ ?

A photon of wavelength $\lambda$ is incident on an electron. After the collision, the photon has wavelength $\lambda^{\prime}$. Show that

$\lambda^{\prime}-\lambda=\frac{h}{m c}(1-\cos \theta),$

where $\theta$ is the scattering angle and $m$ is the electron rest mass.

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