Exam-style question
Try this first
Which of the following best describes a longitudinal wave?.
- A.Particles move perpendicular to wave direction
- B.Particles move parallel to wave direction
- C.Wave speed is constant regardless of medium
- D.Waves can be polarized
Model answer
What a good answer should say
- Particles move parallel to wave direction
Explanation
Why this works
In longitudinal waves, the particle displacement is parallel to the direction of wave propagation, distinguishing them from transverse waves.
Common mistake
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