If at $STP$,the 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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