Two gases $A$ and $B$ are at absolute temperatures $360 \ K$ and $420 \ K$ respectively. The ratio of average kinetic energy of the molecules of gas $B$ to that of gas $A$ is

  • A
    $6: 7$
  • B
    $\sqrt{7}: \sqrt{6}$
  • C
    $7: 6$
  • D
    $49: 36$

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