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Compare the density of the medium at the compression and at the rarefaction during the propagation of sound in the medium.
What is the audible range of frequency for human ear?
What is an echo? Under what conditions can it be heard?
Explain how 'echo' is produced.
What should be the minimum distance between the listener and the reflector to hear an echo of sound propagating with a speed v m s⁻¹?
Does the speed of sound increase or decrease on a hotter day? Justify.
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