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What are the essential properties a medium must possess for the propagation of mechanical waves?

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What are the essential properties a medium must possess for the propagation of mechanical waves?

(a) Stable pressure

(b) Maximum friction

(c) Constant temperature

(d) Minimum friction

I had been asked this question during an interview.

The query is from Waves topic in section Quantum Physics of Engineering Physics I

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The correct choice is (d) Minimum friction

The best I can explain: The friction force amongst the particles of the medium should be negligibly small so that they continue oscillating for a sufficiently long time and the wave travels a sufficiently long distance through the medium

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