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

is more dense than air and thus has more inertia, causing the bunching up of sound

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waves have a speed which is dependent only upon the properties of the medium

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is like all waves; it is able to bend into the regions of space behind obstacles

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

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Solution

The correct option is C is able to reflect off fixed ends and interfere with incident waves vibrates longitudinally; the longitudinal movement of air produces pressure fluctuations
These compressions and rarefactions result because sound is able to reflect off fixed ends and interfere with incident waves vibrates longitudinally; the longitudinal movement of air produces pressure fluctuations. Compressions are the regions of high density and rarefactions are regions of low density.

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Similar questions

Q. Assertion :The longitudinal waves are called pressure waves Reason: Propagation of longitudinal waves through a medium involves changes in pressure and volume of air, when compression and rarefaction are formed

Q. Fill in the blanks with approriate word:
a. The region in a sound wave, with higher pressure and density is called................ and that with low pressure and density is called........... .

b. Medium is ....................... for generation of sound.

c. The total number of compressions and rarefactions produced per second in a sound wave is 1000. The frequency of the sound wave is.................. .

d. Different sound notes have different.............. .

e. In loudspeaker................energy is converted into..................energy.

Which of the following terms apply to sound waves in air and which to water waves ?

Transverse, Rarefaction, Trough, Crest, Compression, Longitudinal

Q. Fill in the blanks with the correct words.
1. Sound is produced because of .................... (vibrations/refractions).
2. Sound travels through air by means of .................... (compressions/depressions) and .................... (rarefactions/refractions).
3. Sound needs a .................... (medium/vacuum) to travel.
4. The .................... (pinna/ear drum) collects sound waves and directs them to the ear tube.
5. The speed of sound is .................... (same/different) in different substances.

Sound waves are longitudinal waves and consists of compression and rarefaction.

A siren has 16 holes and is making 960 revolutions per minute. The frequency of the sound produced by the siren is:

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