At room themperature, the average speed of Helium is Helium is higher than of Oxygen by a factor of :

Monjur Alahi

At room themperature, the average speed of Helium is Helium is higher than of Oxygen by a factor of :
A. `2sqrt2`
B. `6sqrt2`
C. 8
D. 6


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Salim Ahmed Kawsar

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Correct Answer - A
Average speed `(r_(avg))=sqrt((8RT)/(piM))`
`(r_(He))/(r_(O_(2)))=sqrt(M_(O_(2))/(M_(He)))`
`(r_(He))/(r_(o_(2)))=sqrt32/4=2sqrt2`
`r_(He)=r_(o_(2))2sqrt2`

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