A Researcher Is Using $x$ -Rays to Investigating a Cubic Crystal $x$

Short Answer

A researcher is using $x$ -rays to investigating a cubic crystal. He is looking at Bragg reflection from the planes parallel to the cube faces. He finds that when using $x$ -rays with a wavelength of $0.165 \mathrm {~nm}$ , a strong first maximum occurs when the beam makes an angle of $23.5 ^ { \circ }$ with the planes. What is the spacing of adjacent atoms in this crystal?