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For a primitive cubic crystal with a = 3...

For a primitive cubic crystal with `a = 3 xx 10^10` m, what are the smallest diffraction angles 6 for (a) (1 0 0) and (b) (1 1 1) planes for `lambda = 1.50 xx 10^(-10) m`?

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The correct Answer is:
(a) `15.38^(@)`, (b) `25.66^(@)`
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