Physics

Problem

Photon A has initial wavelength

0.010\,\text{nm}

and scatters from a free electron at an angle of

60^{\circ}

. Photon B has initial wavelength

0.070\,\text{nm}

and scatters at

150^{\circ}

. After scattering, the photons have wavelengths

\lambda'_\text{A}

and

\lambda'_\text{B}

, respectively. Which statement is correct? a) The comparison cannot be made without knowing the electron rest mass. b)

\lambda'_{\text A}>\lambda'_{\text B}

\lambda'_{\text A}<\lambda'_{\text B}

\lambda'_{\text A}=\lambda'_{\text B}