A peak in the X-ray diffraction pattern is observed at 2Î¸ = 78o, correspondi

Question

A peak in the X-ray diffraction pattern is observed at 2Î¸ = 78o, corresponding to {311} planes of an
fcc metal, when the incident beam has a wavelength of 0.154 nm. The lattice parameter of the
metal is approximately

Options:

A . 0.6 nm

B . 0.4 nm

C . 0.3 nm

D . 0.2 nm

Answer: Option B

-NA-

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