X-Ray Radiation at a Wavelength of 1

Multiple Choice

X-ray radiation at a wavelength of 1.542 × 10^-10 m is used to irradiate a metallic crystal. The X-rays are being reflected at an angle of 12.73°. If this reflection is a first order reflection(n = 1) , what is the distance between the planes of atoms in this metallic crystal?

A) 3.5 × 10^-10 m
B) 9.5 × 10^-10 m
C) 1.4 × 10^-9 m
D) 4.7 × 10^-10 m
E) 7.0 × 10^-10 m