Q110 · CSIR-NET Chemistry, December 2013

Paper: CSIR-NET December 2013 · Subject: Physical Chemistry · Chapter: Solid State Chemistry · Topic: Crystal Systems Lattices · Marks: 2 · Difficulty: Medium

The angle at which the first order Bragg reflection is observed from (110) plane in a simple cubic unit cell of side $3.238 \AA$, when chromium K radiation of wavelength $2.29 \AA$ is used, is
(a)30°
(b)45°
(c)$60^{\circ}$
(d)90°
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
d₁₁₀ = 3.238/√2 = 2.29 Å; sin θ = λ/2d = 2.29/4.58 = 0.5 ⇒ θ = 30°.

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