The ratio of most probable velocity $(u_{mp})$,average velocity $(u_{av})$,and root mean square velocity $(u_{rms})$ is:

  • A
    $\sqrt{2} : \sqrt{\frac{8}{\pi}} : \sqrt{3}$
  • B
    $1 : \sqrt{2} : \sqrt{3}$
  • C
    $\sqrt{2} : \sqrt{3} : \sqrt{8}$
  • D
    $\sqrt{1} : \sqrt{8\pi} : \sqrt{3}$

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$A$ gas bulb of $1 \ L$ capacity contains $2.0 \times 10^{21}$ molecules of nitrogen gas at a pressure of $7.57 \times 10^3 \ N \ m^{-2}$. Calculate the root mean square speed in $cm \ sec^{-1}$. (in $.5$)

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Select the correct relationship among the following. The symbols have their usual meanings.

Give the formulas for the following:
$(i)$ Average speed of molecules $(u_{av})$
$(ii)$ Most probable speed $(u_{mp})$
$(iii)$ Root mean square speed $(u_{rms})$

If a gas contains only three molecules that move with velocities of $100, 200, 500 \ ms^{-1}$. What is the rms velocity of that gas in $ms^{-1}$?

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