Concept explainers
When a sound wave propagates past a point in the air, what are the changes that occur in the pressure of air at this point?
To Explain: The changes occurring in the pressure of air when a sound wave propagates in the air.
Answer to Problem 30A
The pressure of the air decreases.
Explanation of Solution
Introduction:
The pressure of air changes at a point as a sound wave propagates in the air. The sound wave propagates in air via compressions and rarefactions. Compressions are high pressure region and rarefactions are low pressure region.
During the propagation of a wave, the pressure of the air at a point change. It is observed that the air pressure at that point has less value than before once the wave passes from that point.
Conclusion:
The air pressure reduces as the wave travel or propagates.
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