Exam-style question
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Which of the following is a key difference between a longitudinal and a transverse wave?.
Model answer
What a good answer should say
- The key difference is the direction of particle displacement relative to wave propagation: longitudinal waves have displacement parallel to the direction of travel, whereas transverse waves have displacement perpendicular to it.
Explanation
Why this works
This answer follows the compare reasoning pattern: it defines both wave types, identifies the most important difference (direction of displacement), explains when each applies (longitudinal in sound, transverse in light and string waves), and concludes by stating the distinguishing feature. It tests the student’s ability to compare and contrast the two wave types.
Common mistake
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