Question

Choose the correct statement(s) regarding unit cell.

• A. 2 and 4
• B. 1 and 2
• C. 2 and 3
• D. All the given statements are correct.

Answer 1

The correct option is A 2 and 4

Contribution of corner particles:
A particle at the corner of a unit cell is shared by eight-unit cells. So, each particle contributes $\frac{1}{8}$ part to the unit cell.


Contribution of face-centred particle:
A particle at the face-centre is shared by two-unit cells.
So, each particle contributes $\frac{1}{2}$ part to the unit cell.


Thus, statements (2) and (4) are correct. Hence option (a) is correct.