Question

A sound wave is a pressure wave; regions of high pressure (compressions) and low pressure (rarefactions) are established as the result of the vibrations of the sound source. These compressions and rarefactions result because the sound

• A. is more dense than air and thus has more inertia, causing the bunching up of sound
• B. waves have a speed which is dependent only upon the properties of the medium
• C. is like all waves, it is able to bend into the regions of space behind obstacles
• D. is able to reflect off fixed ends and interfere with incident waves vibrates longitudinally, the longitudinal movement of air produces pressure fluctuations

Answer 1

The correct option is D

is able to reflect off fixed ends and interfere with incident waves vibrates longitudinally, the longitudinal movement of air produces pressure fluctuations

1. Sound is a mechanical wave that results from the back-and-forth vibration of the particles of the medium through which the sound wave is moving.
2. The motion of the particles is parallel (and anti-parallel) to the direction of the energy transport.
3. Thus, A sound wave is a pressure wave; regions of high pressure (compressions) and low pressure (rarefactions) are established as the result of the vibrations of the sound source. These compressions and rarefactions result because sound vibrates longitudinally, the longitudinal movement of air produces pressure fluctuations

Hence, Option (d) is the correct answer.