X-rays of 173 pm wavelength are reflected by the (111) plane of a cubic primitive crystal at θ=30°. The unit cell length (in pm) is closest to

(b) 300. Explanation: d₁₁₁ = λ/(2 sin 30°) = 173 pm; a = d√3 = 300 pm.

Q142 · CSIR-NET Chemistry, December 2019

Paper: CSIR-NET December 2019 · Subject: Physical Chemistry · Chapter: Solid State Chemistry · Topic: Crystal Systems Lattices · Marks: 2 · Difficulty: Medium

X-rays of 173 pm wavelength are reflected by the (111) plane of a cubic primitive crystal at $\theta=30^{\circ}$. The unit cell length (in pm) is closest to

(a)173

(b)300

(c)346

(d)600

Answer

Answer: B ✓ checked by 4AB · confidence high

Explanation

d₁₁₁ = λ/(2 sin 30°) = 173 pm; a = d√3 = 300 pm.

Study loop for Solid State Chemistry

1. Practise the PYQsPrevious-year questions, with answers

· Browse this chapter in the app