If an X-Ray Beam of Wavelength 1

Multiple Choice

If an X-ray beam of wavelength 1.4 × 10^-10 m makes an angle of 30° with a set of planes in a crystal causing first order constructive interference, what is the plane spacing?

A) 2.8 × 10^-10 m
B) 0.7 × 10^-10 m
C) 3.2 × 10^-10 m
D) 1.6 × 10^-10 m
E) 1.4 × 10^-10 m