X-Ray Diffraction: A crystal is irradiated with x-rays with a wavelength of 0.120 nm. The atomic planes in the crystal are separated by 0.21 nm. At what angles of incidence with respect to the normal will the x-rays reflect from the crystal?
A. 73°, 55°, 31°
B. only 55°
C. only 73° and 31°
D. only 73°
Answer: A
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