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°
D
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What will be an ideal response?