Potassium Iodide (Chemical Formula: KI) Has a Face-Centered Cubic Structure

Multiple Choice

Potassium Iodide (chemical formula: KI) has a face-centered cubic structure (just like sodium chloride) . If the distance between crystal planes is d = 0.353 nm and X-rays of wavelength λ = 0.0934 nm are used, what is the smallest angle θ at which a diffraction maximum may be obtained?

A) 9.92°
B) 7.60°
C) 13.3°
D) 15.5°
E) 6.52°