If at $STP$, velocity of sound in a gas $(\gamma=1.5)$ is $600 \,m / s$, the $r.m.s.$ velocity of the gas molecules at $STP$ will be ........... $m / s$
  • A$400$
  • B$600$
  • C$600 \sqrt{2}$
  • D$300 \sqrt{2}$
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