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Question

The velocities of sound at the same temperature in two monoatomic gases of densities p1 and p2 are v1 and v2 respectively. If p1/p2=4, then the value of v1/v2 is

A
14
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B
2
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C
12
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D
4
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Solution

The correct options are
A 14
C 12
For velocity of sound in gas
v=pγp
[P is pressure and p is density of gas, γ is Cp/Cv]
Here, v1=γPp1 and v2=γPp2
v1v2=p2p1=14=12

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