$9.$A $0\mathrm{.}880-$MeV photon is scattered by a free electron initiallyat rest such that the scattering angle of the scatteredelectron is equal to that of the scattered photon $($q$=$f$).($a$)$ Determine the angles q and f $($b$)$ Determinethe energy and momentum of the scattered photon.$($c$)$ Determine the kinetic energy and momentum of thescattered electron. $($a$)43\mathrm{.}0\backslash$deg $($b$)602$ keV, $3\mathrm{.}21$ x$10-22$ kg $.$ m$/$s$($c$)278$ keV, $3\mathrm{.}21$ x$10-22$ kg $.$ m$/$s