What is the maximum possible kinetic energy (keV) of a Compton electron and the corresponding…

What is the
maximum possible kinetic energy (keV) of a Compton electron and the
corresponding minimum energy of a scattered photon resulting from scattering of
(a) a 100-keV photon, (b) a 1-MeV photon, and (c) a 10-MeV photon? Estimate for
each case the range the electron would have in air of 1.2 mg/crn3 density and
in water of 1 g/cm3 density.