Q$-11)$ It is given as a face$-$centered cubic structure with a Lattice constant of $40$ A $(1$

A

$$

$=1\backslash$times $10$

$10$

meters$).$ Determine the number of atoms per unit area in the $($

$1$

$$

$1$

$$

$1$

$$

$)$ plane also plot and calculate the density of atoms of unit length in the $[$

$1$

$$

$1$

$$

$0$

$$

$]$ direction. $($n

$(111)$

$$

$=$

$2$

$3$

$$

$$

a

$0$

$2$

$$

Number of atom

$$

$,$n

$[110]$

$$

$=$

a

$0$

$$

$2$

$$

Number of atom

$$

$)$