Particle acceleration in a progressive longitudinal wave is

zero

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parallel to wave velocity.

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perpendicular to wave velocity.

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None of these

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Solution

The correct option is C parallel to wave velocity.
In any wave, particle acceleration is always parallel to the direction of oscillation. A longitudinal wave is the one in which the particles oscillate parallel to the direction of propagation of the wave. Hence the acceleration is parallel to wave velocity.

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Particles in a longitudinal wave move perpendicular to the direction of the wave propagation.

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