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The average velocity of gas molecules is...

The average velocity of gas molecules is `400 m s^(-1)`. Calculate their `rms` velocity at the same temperature.

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`V_(average)=sqrt((8RT)/(pi M))`
`V_(rms)=sqrt((3RT)/(M))`
`:. (V_(rms))/(V_(average))=sqrt((3pi)/(8))`
`=400xxsqrt((3xx3.14)/(8))=434.02 m s^(-1)`
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