First slide

Travelling wave

Question

Compare the velocities of sound in hydrogen and carbon dioxide

Moderate

A

2.3
B

4.85
C

2.5
D

5.6

Solution

$S p e e d o f S o u n d i n g a s V = \sqrt{\frac{γ R T}{M}} \Rightarrow \frac{V_{1}}{V_{2}} = \sqrt{\frac{γ_{1} M_{2}}{γ_{2} M_{1}}} \Rightarrow \frac{V_{1}}{V_{2}} = {(\frac{1.4}{1.3} \times \frac{44}{2})}^{1 / 2} = 4.85$

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