The ratio of root mean square velocity of $H_2$ at $50 \ K$ to that of $O_2$ at $800 \ K$ is

  • A
    $4$
  • B
    $2$
  • C
    $1$
  • D
    $0.25$

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Explain the following terms:
$(i) u_{mp}$
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$(iv) u_{rms}$

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