After colliding with a free electron

PHYSICS · Single correct · AP · Physics 2: Algebra-based · Modern Physics · Modern Physics

Problem

After colliding with a free electron, a photon emerges at an angle of

120^{\circ}

with an energy of

200\,\text{keV}

. What was the photon’s incident wavelength? (Use

hc=1240\,\text{eV}\cdot\text{nm}

and electron Compton wavelength

=2.43\times10^{-12}\,\text{m}

.) (a)

0.0062\,\text{nm}

(b)

0.0098\,\text{nm}

(c)

0.0026\,\text{nm}

(d)

0.0050\,\text{nm}