The rms velocity of an ideal gas at $27^{\circ}C$ is $0.3\;m/s$. Its rms velocity at $927^{\circ}C$(in m/s.) is :

Question

$$(a)\;3.0 \qquad (b)\;2.4 \qquad (c)\;0.9 \qquad (d)\;0.6$$