The next five questions correspond to the

following Iron and Carbon $($steel$)$ system.

You may use the provided cube to draw the

structure.

Above $727C$ iron has a face centered cu$-$

bic lattice with a basis of

Fe: $000$

What is the linear atomic density of $Fe$ in the $[110]$ direction at $800C?$

A$.\frac{1}{a\sqrt[\phantom{2}]{2}}$

B$.\frac{2}{a\sqrt[\phantom{2}]{2}}$

C$.\frac{1}{a\sqrt[\phantom{2}]{3}}$

D$.\frac{2}{a\sqrt[\phantom{2}]{3}}$