Speed of sound in a gas is $v$ and $r.m.s.$ velocity of the gas molecules is $c.$ The ratio of $v$ to $c$ is
  • A$\frac{3}{\gamma }$
  • B$\frac{\gamma }{3}$
  • C$\sqrt {\frac{3}{\gamma }} $
  • D$\sqrt {\frac{\gamma }{3}} $
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