alleryIn a longitudinal wave, particles vibrate:
AIn random directions
BParallel to wave direction
CNot at all
DPerpendicular to wave direction
Answer & Solution
Correct answer: B. Parallel to wave direction
In a longitudinal wave (like sound in air), particles oscillate back and forth ALONG the direction of wave travel.
In transverse waves (like light), particles vibrate PERPENDICULAR to wave direction.
This is the defining distinction.
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