In the Compton effect a photon of wavelength 
and frequency f is scattered from and electron, initially at rest. In this process
A. the photon loses energy so that the scattered photon has frequency less than f.
B. the momentum is not conserved, but the energy is.
C. the electron gives energy to the scattered photon so that the photon's frequency is greater than f.
D. the electron gains energy from the photon so that the scattered photon's wavelength is less than f.
A. the photon loses energy so that the scattered photon has frequency less than f.
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