Exam-style question
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Which of the following best describes a longitudinal wave?.
Model answer
What a good answer should say
- A longitudinal wave is a wave in which the displacement of the medium is parallel to the direction of wave propagation, producing alternating regions of compression and rarefaction.
Explanation
Why this works
The answer demonstrates understanding of the defining characteristic of longitudinal waves – particle motion parallel to wave travel – and distinguishes it from transverse waves where motion is perpendicular. It tests the student’s ability to recall the definition and apply it to identify the correct wave type.
Common mistake
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