$N( < 100)$ molecules of a gas have velocities $1, 2, 3\,.\,.\,.\,.\,.N/km/s$ respectively. Then
  • A
    rms speed and average speed of molecules is same.
  • Bratio of rms speed to average speed is $\sqrt {\left( {2N + 1} \right)\left( {N + 1} \right)} /6N$
  • Cratio of rms speed to average speed is $\sqrt {\left( {2N + 1} \right)\left( {N + 1} \right)} /6$
  • Dratio of rms speed to average speed of a molecule is $2/\sqrt 6 x \sqrt {\left( {2N + 1} \right)\left( {N + 1} \right)} $
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