The speed of four gas molecules are 1 km...

The speed of four gas molecules are `1 km//s`, `3 km//s`, `5km//s` and `7 km//s` respectively. The difference between their r.m.s. speed and average speed is

A

`0.583 km//s`

B

`0.438 km//s`

C

`0.358 km/s`

D

`0.638 km/s`

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