Author Question: Potassium Iodide (chemical formula: KI) has a face-centered cubic structure (just like sodium ... (Read 133 times)

naturalchemist · **on:** Jul 28, 2018

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 l = 0.093 4 nm are used, what is the smallest angle q at which a diffraction maximum may be obtained?
a. 9.92
b. 7.60
c. 13.3
d. 15.5
e. 6.52

Question 2

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