A photon of wavelength strikes a free electron at rest

PHYSICS · Subjective · AP · Physics 2: Algebra-based · Modern Physics · Modern Physics

Problem

A photon of wavelength

0.070\,\text{nm}

strikes a free electron at rest. The scattered photon has wavelength

0.072\,\text{nm}

and travels at a right angle (

90^{\circ}

) to the incident direction. Using

h=6.63\times10^{-34}\,\text{J}\cdot\text{s}

, determine the angle between the recoil electron’s momentum and the incident photon’s direction.