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Answer:
A longitudinal wave is a wave where the displacement of the medium is in the same direction than the propagation of the wave.
This means that as a P wave travels through the Earth, the relative motion between the p wave and the particles is near zero, as the motion of the particles is parallel to the motion of the wave.
An example of this would be the waves generated when you throw a rock in water, you can see how the water particles move along the waves in the water.
The relative motion between the p wave and the particles is almost negligible.
- In case of a longitudinal wave, the displacement of the medium is in the same direction as the direction of the propagation of the wave.
- This property suggests that as a P wave travels through the Earth, the particles also move along in the same direction. The relative motion between the p wave and the particles is almost negligible.
- In case of transverse waves, the displacement of particles of the medium and the direction of the propagation of the wave is perpendicular to each other
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