Exam-style question
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Explain how stationary waves are formed from two progressive waves.
Model answer
What a good answer should say
- Stationary waves are formed when two progressive waves of the same frequency and amplitude travel in opposite directions and interfere with each other.
- This interference creates points of no displacement called nodes and points of maximum displacement called antinodes.
Explanation
Why this works
This answer demonstrates an understanding of the concept of stationary waves and the principle of superposition. It tests the student's ability to articulate the conditions necessary for stationary wave formation.
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