(A) : The longitudinal waves are called pressure waves.
(R) : Propagation of longitudinal waves through a medium involves changes in pressure and volume of medium, when compression and rarefaction are formed.

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(A) is true but (R) is false

Both (A) and (R) are true but (R) is not the correct explanation of (A)

Both (A) and (R) are true and (R) is the correct explanation of (A)

Both (A) and (R) are false

answer is A.

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Detailed Solution

Moving particles are displaced along the wave's propagation path as longitudinal waves move through a medium.

Particles are therefore closer together at some points than they are farther apart at other points. Due to the change in medium density caused by this, pressure differences develop in the material medium.
Pressure waves are so-called because they result from pressure disturbances caused by longitudinal waves propagating across a material.

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