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Explain why sound travels faster in water than in air. Include a brief explanation related to the medium's properties.
What is an echo? Under what conditions can it be heard?
An object moving at a speed greater than that of sound is said to be moving at
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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