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The formation of echoes can take place when the reflecting surfaces are located at a distance greater than __________

(a) 7 m

(b) 10 m

(c) 13 m

(d) 17 m

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Correct choice is (d) 17 m

To explain: The formation of echoes can take place when the reflecting surfaces are located at a distance greater than 17m. This defect can be removed by making surfaces highly absorbent.

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