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Four molecules have speed 2 km/s, 3 km/s. 4 km/s, 5 km/s The rms speed of these molecules in km/s is ............. .

Answer»

`SQRT(27/2)`
`sqrt(27)`
`2sqrt(27)`
`sqrt(54)`

SOLUTION :`nu_(RMS)=sqrt((nu_(1)^(2)+nu_(2)^(2)+....+nu_(n)^(2))/n)=sqrt((2^(2)+3^(2)+4^(2)+5^(2))/4)=sqrt(27/2)`


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