A certain crystal has an interatomic spacing of 0.442 nm. A beam of neutrons moving with a speed of 1640 m/s is diffracted from the crystal. What is the angle of the second interference maximum?
A) 17.0°
B) 21.0°
C) 33.0°
D) 60.0°
E) 90.0°

Question

Quizplus · Accepted Answer

The de Broglie wavelength of the neutrons is calculated using λ = h/(mv), where h is Planck's constant and mv is the momentum. Using the Bragg's law nλ = 2d sin(θ) for the second maximum (n=2), we solve for θ.

A Certain Crystal Has an Interatomic Spacing of 0