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Two samples of gases 'a' and 'b' are at ...

Two samples of gases 'a' and 'b' are at the same temperature. The molecules of 'a' are travelling 4 times faster than molecules of 'b'. The ratio of `M_a//M_b` will be 

A

`1//4`

B

`16//1`

C

`4//1`

D

`1//16`

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The correct Answer is:
D
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