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| Q. |
Velocity of sound in air does not change with the change of – |
| A. | Temperature of air |
| B. | Pressure of air |
| C. | Moisture content in air |
| D. | Wind in the direction of propagation of sound |
| Answer» B. Pressure of air | |
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Explanation: The speed of sound in an ideal gas is independent of frequency, but it weakly depends on frequency for all real physical situations. It is a function of the square root of the absolute temperature, but is independent of pressure or density for a given ideal gas. Sound speed is slightly dependent on pressure only because air is not quite an ideal gas. |
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