A wave whose particles vibrate parallel to the direction in which the wave travels. Longitudinal wave. In a longitudinal wave, particles move back and forth in the same direction as the wave travels, like sound waves in the air.
Longitudinal Wave: A wave whose particles vibrate parallel to the direction in which the wave travels. Longitudinal wave. In a longitudinal wave, particles move back and forth in the same direction as the wave travels, like sound waves in the air.
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