Powder specimens of three different monoatomic cubic crystals are analyzed with a Debye-Scherrer camera. It is...

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Powder specimens of three different monoatomic cubic crystalsare analyzed with a Debye-Scherrer camera. It is known that onesample is fcc, one is bcc, and one has the diamond structure. Theapproximate positions of the first four diffraction rings in eachcase are: A: 42.2, 49.2, 72.2, 87.3; B: 28.8, 41.0, 50.8, 59.6; C:42.8, 73.2, 89.0, 115.0 (a) Identify the crystal structures of A,B, and C. (b) If the wavelength of the incident x-ray beam is 1.5Ã…,what is the length of the side of the conventional cubic cell ineach case?

There is already an answer on Chegg for this question, but itdoesnt elaborate on why things were done, I don't understand how towork backwards from the angles to get the structure

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