If the interplanar spacing of NaCl is 2.814 × 10?10 m, what is the predicted angle at which X-rays of wavelength 0.140 nm will be diffracted in a first-order maximum?
A. 31.3°
B. 7.20°
C. 20.5°
D. 14.4°
E. 29.8°
Answer: D
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