Question

Propagation of sound can be visualized as:

• A. Propagation of density variations
• B. Propagation of pressure variations
• C. Series of compressions and rarefactions
• D. All of the above.

Answer 1

The correct option is D All of the above.

During vibration, when a particle moves forward, it compresses the air in front of it and creates a high pressure or high-density region. This region is called compression. When a particle moves backward, it creates a low pressure or low-density region. This region is called rarefaction.
A sound wave can be visualized as a series of compressions and rarefactions. Hence, it is also the same as propagation of pressure or density variations.