Four molecules of ags have speeds 1,2,3 ...

Four molecules of ags have speeds 1,2,3 and 4 `km//s`.The volue of the root mean square speed of the gas molecules is

A

`1/2sqrt15kms^-1`

B

`1/2sqrt10kms^-1`

C

`2.5kms^-1`

D

`sqrt(15//2)kms^-1`

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The correct Answer is:

D

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