A Photon Collides with an Electron $0 ^ { \circ }$

Multiple Choice

A photon collides with an electron.After the collision the wavelength of the scattered wave at a scattering angle greater than $0 ^ { \circ }$ is

A) greater than or equal to the initial wavelength.
B) equal to the initial wavelength.
C) less than or equal to the initial wavelength.
D) greater than the initial wavelength.
E) less or greater depending on the scattering angle.