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$1 : \sqrt{\frac{8}{\pi}} : \sqrt{3}$
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