Percentage of free space in cubic close packed struchure and in body centred structure are respectively.

Options

A. `1.6 xx 10^(21) cm^(3)`
B. `2.81 xx 10^(-23) cm^(3)`
C. `6.02 xx 10^(-23) cm^(3)`
D. `6.6 xx 10^(-24) cm^(3)`

Answer

b

Explanation

Volume of unit cell `= a^(3)`
`= (3.04 xx 10^(-4) cm)^(3) = 2.81 xx 10^(-23) cm^(3)`