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What is a non dispersive medium?...

What is a non dispersive medium?

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A medium in which speed of a wave is independent of frequency of wave is called a non-dispersive medium. For example, air is a non-dispersive medium for sound waves.
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PRADEEP-OSCILLATIONS AND WAVES-Short Answer Questions
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  3. What is a non dispersive medium?

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  15. What will be the speed of sound in a perfectly rigid rod?

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