Potassium Iodide (Chemical Formula: KI) Has a Face-Centred Cubic Structure $\lambda$

question 19

Multiple Choice

Potassium Iodide (chemical formula: KI) has a face-centred 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\(\degree\)

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