The largest distance between the interatomic planes of a crystal is 10-7 cm. The upper limit for the wavelength of X-rays which can be usefully studied with this crystal is
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a
1Ao
b
2Ao
c
10Ao
d
20Ao
answer is D.
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Detailed Solution
Bragg's law,2dsinθ=nλ or λ=2dsinθnFor maximum wavelength, nmin=1,sinθmax=1∴λmax=2d or λmax=2×10−7cm=20Ao