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Monochromatic X-rays reflected from a calcite crystal (lattice constant ? = 3? ) give rise to first order Bragg reflection at 6.7?. The wavelength of these X-rays will be

[A].	0.07 A	[B].	0.7 A
[C].	7A	[D].	70 A
[E].	170 A

Answer: Option B

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