Q.

Angle at which second-order diffraction will occur in an X-ray spectrometer when X-rays of 200 pm are diffracted by the atoms of a crystal having distance between the two planes as 400 pm is

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a

45°

b

90°

c

30°

d

60°

answer is A.

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Detailed Solution

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For nth order diffraction, nλ=2asinθ

sinθ=nλ2a

n = 2

sinθ=λa=200pm400pm=12

θ=sin112=30

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