The largest distance between the interatomic planes of a crystal is 2 x 10-7cm. The upper limit for the wavelength of X-rays which can be usefully studied with this crystal is

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1 Å

2 Å

40 Å

20 Å

answer is C.

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Detailed Solution

Bragg's law, 2dsinθ=nλ or λ=2dsinθnFor maximum wavelength, nmin=1, (sinθ)max=1∴ λmax=2d or λmax=4×10−7cm=40 Å

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