A Beam of X-Rays of Different Frequencies Is Reflected at 10

Multiple Choice

A beam of X-rays of different frequencies is reflected at 10 degrees off a crystal of interatomic spacing 0.2 nm.Which X-ray wavelength is preferentially reflected?

A) 0.0943 nm
B) 0.139 nm
C) 0.069 5 nm
D) 1.02*10^-10 m
E) 3.47 *10^-11 m