Correct Response: C. The speed of sound in a gas is approximately equal to the average speed of the gas molecules. Since the average speed of the gas molecules increases with temperature, the speed of sound through a gas increases with increasing temperature. The speed of sound in an ideal gas is not affected by the frequency (A) of the sound. In air, reducing the frequency results in a very slight reduction in the speed of sound. Replacing the gas with a more dense gas (B) would result in a reduction in speed since the molecules are heavier. The speed of sound is independent of the amplitude (D).
