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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)/(2) sqrt(15)` km/s

B

`(1)/(2) sqrt(10)` km/s

C

`2.5` km/s

D

`sqrt((15)/(2))` km/s

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The correct Answer is:
D
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