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The respective speeds of the molecules a...

The respective speeds of the molecules are 1, 2, 3, 4 and 5 km/sec. The ratio of their r.m.s velocity and the average velocity will be

A

`sqrt(11):3`

B

`3 : sqrt(11)`

C

`1:2`

D

`3:4`

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The correct Answer is:
A
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