First slide

Travelling wave

Question

Velocity of sound measured in hydrogen and oxygen gas at a given temperature will be in the ratio

Moderate

A

1 : 4
B

4 : 1
C

2 : 1
D

1 : 1

Solution

$v∝ \frac{1}{\sqrt{M}} \Rightarrow \frac{v_{H_{2}}}{v_{O_{2}}} = \sqrt{\frac{M_{O_{2}}}{M_{H_{2}}}} = \sqrt{\frac{32}{2}} \Rightarrow \frac{v_{H_{2}}}{v_{O_{2}}} = \frac{4}{1}$

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