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Effect of Wind on Speed of Sound

The speed of ...

Question

The speed of sound in hydrogen at STP is v, What is the speed of sound in helium at STP?(approximately)

\frac{v}{\sqrt{2}}

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\frac{v}{2}

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\sqrt{2} v

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2 v

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Solution

The correct option is A $\frac{v}{\sqrt{2}}$
Speed of sound $\propto \frac{1}{\sqrt{M}}$

And since helium gas weigh twice of hydrogen gas, so correct answer is A

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