Q32 · CSIR-NET Chemistry, December 2015

Paper: CSIR-NET December 2015 · Subject: Physical Chemistry · Chapter: Solid State Chemistry · Topic: Crystal Systems Lattices · Marks: 2 · Difficulty: Medium

For a simple cubic crystal lattice, the angle between the [201] plane and the xy plane is

(a)less than 30°

(b)between 30° and 45°

(c)between $45^{\circ}$ and $60^{\circ}$

(d)greater than $60^{\circ}$

Answer

Answer: D ✓ checked by 4AB · confidence high

Explanation

The angle between planes equals the angle between their normals: cos θ = (2,0,1)·(0,0,1)/√5 = 0.447, θ ≈ 63° (d).

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