If the $r.m.s.$ velocity of a gas at a given temperature (Kelvin scale) is $300\, m/sec$. What will be the $r.m.s.$ velocity of a gas having twice the molecular weight and half the temperature on Kelvin scale ....... $m/sec$
  • A$300$
  • B$600$
  • C$75$
  • D$150$
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