Iron exhibits bcc structure at room temperature.
Above 900°C, it transforms to fcc structure. The
ratio of density of iron at room temperature to that
at 900°C (assuming molar mass and atomic radii of
iron remains constant with temperature) is
(1)``\frac{\sqrt3}{\sqrt2}``
(2)``\frac{4\sqrt3}{3\sqrt2}``
(3)``\frac{3\sqrt3}{4\sqrt2}``
(4)``\frac{1}{2}``