Potassium Iodide (Chemical Formula: KI)has a Face-Centered Cubic Structure (Just $\lambda$

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 $\lambda$ = 0.093 4 nm are used,what is the smallest angle $\theta$ at which a diffraction maximum may be obtained?

A) 9.92 $\degree$
B) 7.60 $\degree$
C) 13.3 $\degree$
D) 15.5 $\degree$
E) 6.52 $\degree$

Correct Answer:

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