Discussion
The sound velocity in the air at 0°C is :
Answer: B
The speed of sound in air at 0°C is about 331 m/s.
The speed of sound in an ideal gas is
\[ v = \sqrt{\frac{\gamma R T}{M}} \]
With \(\gamma = 1.4\), \(R = 8.314\) J/mol K, \(T = 273\) K and \(M = 0.029\) kg/mol for air, this gives about 331 m/s. It rises by roughly 0.6 m/s for each degree, to about 343 m/s at 20°C.
The other figures belong to denser media: around 1,435 to 1,500 m/s is the speed of sound in water, and about 5,100 m/s is typical of iron or steel. 1,269 m/s is far too fast for air.
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