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Any material medium can be pictured as a collection of:

ACoupled oscillators
BRigid steel planks
CFrozen fixed points
DIsolated charges
Answer & Solution
Correct answer: A. Coupled oscillators
1. Waves travel because neighbouring parts of a medium interact. 2. Each part can oscillate about its own position. 3. So a medium is pictured as coupled oscillators. _Source: syllabus Physics Part II, Chapter 14, Oscillations._
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