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vm and vd are the velocities of sound in...

`v_m` and `v_d` are the velocities of sound in humid air and dry air respectively. The relation between them is

A

`v_m gt v_d`

B

`v_m ltv_d`

C

`v_m=v_d`

D

`v_m=frac(v_d)(2)`

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