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Show that the velocity of sound in a gas...

Show that the velocity of sound in a gas of `gamma=1.41` is `0.68 C` where `C` is the root mean squar velocity of its molecules.
[Hint: `C=sqrt((gammaP)/(D))` and `P=1/3 DC^(2)` where `C` is root mean square velocity]

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NN GHOSH-VELOCITY OF SOUND-EXERCISE
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