Question: In their book X-rays and crystal structures (which begins 'It is now two years since Dr. Laue conceived the idea ... ') the Braggs give

In their book X-rays and crystal structures (which begins 'It is now two years since Dr. Laue conceived the idea ... ') the Braggs give a number of simple examples of X-ray analysis. For instance, they report that the reflection from (100) planes in KCI occurs at 5° 23', but for NaCI it occurs at 6° 0' for X-rays of the same wavelength. If the side of the NaCI unit cell is 564 pm, what is the side of the KCI unit cell? The densities of KCI and NaCI are 1.99 g cm-1 and 2.17 g cm-1 respectively. Do these values support the X-ray analysis?

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2a sin 100 as 100 a 2 sin 100 Therefore a aKCI sin 9100 NaCl aNaCl sin 100 ... View full answer

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