A Compton scattering experiment is performed using an aluminum target. The incident photons have wavelength . The

A Compton scattering experiment is performed using an aluminum target. The incident photons have wavelength λ. The scattered photons have wavelengths λ ′ and energies E that depend on the scattering angle θ.
(a) At what angle q are scattered photons with the smallest energy detected?
(b) At this same scattering angle θ, what is the ratio λ′ / λ for λ = 10.0 pm?