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Four molecules of a gas have speeds 2, 4...

Four molecules of a gas have speeds `2, 4, 6` and `8 kms^(-1)` respectively. Calculate their root mean square speed.

A

`sqrt(7.5)`

B

`sqrt(30)`

C

30

D

15

Text Solution

Verified by Experts

The correct Answer is:
A
r.m.s. `= sqrt((1^(2) + 2^(2) + 3^(2) + 4^(2))/(4)) = sqrt(7.5)`
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