Question

Iron has a BCC structure with atomic radius 0.123 Å. Find the lattice constant.

(a) 0

(b) 4.587 Å

(c) 2.314 Å

(d) 0.2840 Å

The question was posed to me in an internship interview.

The origin of the question is Classification of Solids topic in chapter Mechanical Properties of Solids of Engineering Physics I

Answer 1

Correct choice is (d) 0.2840 Å

To elaborate: r = 0.123 Å

The lattice constant for BCC = 4r/√3

The lattice constant = 0.2840 Å.