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What are longitudinal waves ? Give illus...

What are longitudinal waves ? Give illustrative example of such waves.

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Longitudinal waves `:` In a wave motion, the direction of the propagation of the wave and vibrations of particles are in the same direction, the waves are said to be longitudinal waves.
Illustration `:`
(1) Longitudinal waves may be easily illustrated by releasing a compressed spring. ltbr. (2) A series of compression and rare factions ( expansions) propagate along the spring.

C= Compression, R=Rarefaction.
(3) They can travel in solids,liquids and gases.
(4) Ex `:` Sound waves.
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