The volume of atom present in a face-centred cubic unit cell of a metal (`r` is atomic radius ) is

Options

A. `16/3 pr^3`
B. `20/3 pi r^3`
C. `24/3 pi r^3`
D. `12/3 pi r^3`

Answer

A

Explanation

in fcc , no. of atoms = 4
volume occupied = ` 4 [4/3 pi r^3] = 16/3 pi r^3`