a) What is the shortest wavelength of the X-rays emitted when a beam of electrons with a kinetic energy of 15 keV strikes a Ni target? b) What is the kinetic energy of the electrons if the shortest emitted wavelength is 0.1 nm? An X-ray photon with a wavelength of 0.0124 nm is Compton scattered by a free electron at rest. After the collision, the angle of the detected photon is 90 with respect to the original direction. a) What is the wavelength of the scattered photon? b) What is the kinetic energy of the recoil electrons? c) Is there a scattering angle that produces photons with a wavelength of 0.02 nm? What is the value of that angle? d) What is the change in the wavelength if the initial X-ray photon was Compton scattered at an angle of 90 by a proton?