Q69 · CSIR-NET Chemistry, June 2017

Paper: CSIR-NET June 2017 · Subject: Physical Chemistry · Chapter: Solid State Chemistry · Topic: Crystal Systems Lattices · Marks: 2 · Difficulty: Medium

Metallic silver crystallizes in face-centred-cubic lattice structure with a unit cell of length 40 nm . The first order diffraction angle of X-ray beam from (2, 1, 0) plane of silver is 30°. The wavelength of X-ray used is close to
(a)11 nm
(b)18 nm
(c)25 nm
(d)32 nm
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
d₂₁₀ = 40/√5 = 17.9 nm; λ = 2d sin 30° = 17.9 nm ≈ 18 nm.

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