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(a) What is an echo? How is echo formed?...

(a) What is an echo? How is echo formed?
(b) What is the minimum distance in air required from a sound reflecting surface to hear an echo (at `20^(@)C)`?
(c) A man standing 825 metres away from a cliff (steep rock) fires a gun. After how long will he hear its echo? Speed of sound in air is `330m//s`.

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