If the Scattering Angle in a Compton Scattering Is 90^o

Multiple Choice

If the scattering angle in a Compton scattering is 90^o, the corresponding wavelength shift is

A) 2.43 * 10^-12 m.
B) 2.43 * 10^-9 m.
C) 3.42 * 10^-9 m.
D) 3.42 *10^-12 m.
E) 0 m.