Question regarding compton scattering:

a photon with wavelength = 0.1385 nm scatters from an electron that is initially at rest. what must be the angle between the direction of propagation of the incident and scattered photons if the speed of the electron immediately after the collision is 8.90*10^6 m/s?

Which of the following is a characteristic shared by both electron and light microscopes? a. they both employ the use of objective lenses. b. both microscopes require an internal camera to visualize the specimen. c. both microscopes have a resolving power of 0.01 nm. d. they both utilize white light to magnify the specimen.