Question: A substance known to have a cubic unit cell gives reflections with radiation of wavelength 137 pm at the glancing angles 10.7, 13.6, 17.7, and

A substance known to have a cubic unit cell gives reflections with radiation of wavelength 137 pm at the glancing angles 10.7°, 13.6°, 17.7°, and 21.9°. The reflection at 17.7" is known to be due to the (111) planes. Index the other reflections.

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