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The speed of four gases molecules are 1 ...

The speed of four gases molecules are 1 km/s, 3 km/s, 5 km/s and 7 km/s respectively. The difference between the R.M.S. speed and average speed is

A

0.683 km/s

B

0.583 km/s

C

0.438 km/s

D

0.358 km/s

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The correct Answer is:
B
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