Question

The regions of compressions and rare fractions of sound wave are established because

• A. The sound wave undergoes diffraction behind obstacles
• B. the reflected sound wave at fixed end interferes with the incident wave
• C. the longitudinal movement of air molecules produce pressure fluctuations
• D. the speed of the sound wave changes as it travels through a medium

Answer 1

The correct option is C

the longitudinal movement of air molecules produce pressure fluctuations

Explanation

1. As sound waves are longitudinal waves, there will be a change in pressure across the wave propagation.
2. The air molecules vibrate longitudinally and create pressure which results in the formation of compressions and rare.

Hence, option C is correct.