In the rest frame of an electron, an incident y-ray with an energy of 0.25 MeV interacts with the electron. Following the collision, the y-ray has a final energy of 0.1 MeV. What is the angle between the y-ray's initial direction and its final direction? Explain how this type of scattering differs from the classical prediction.

In the rest frame of an electron, an incident y-ray with an energy of 0.25 MeV interacts with the electron. Following the collision, the y-ray has a final energy of 0.1 MeV. What is the angle between the y-ray's initial direction and its final direction? Explain how this type of scattering differs from the classical prediction.