write two important condition for production of an echo
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To produce an echo, the conditions required a are: (i) There should be sufficient time gap between original and reflected sounds. ... An echo will be heard distinctly if the minimum distance between the source of sound and the obstacle is 34.4/2 = 17.2 m. (iii) Nature of the obstacle plays an important role.
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Answer:a minimum distance 16.5 m and fewer objexts
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