X rays of wavelength 0.0196 nm are directed in the positive direction of an x axis onto a target containing loosely bound electrons. For Compton scattering from one of those electrons, at an angle of 145°, what are
(a) the Compton shift (in pm),
(b) the corresponding change in photon energy (in keV),
(c) the kinetic energy (in keV) of the recoiling electron, and
(d) the angle between the positive direction of the x axis and the electron's direction of motion? The electron Compton wavelength is 2.43 x 10-12 m. only part (d),