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The minimum distance between the source of the sound and the obstacle for an echo (at 20°C) to take place is:

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The minimum distance between the source of the sound and the obstacle for an echo (at 20°C) to take place is: 

(A) 17.2 m 

(B) 1.72 m 

(C) 17.8 m 

(D) 34.4 m

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The answer is (A) 17.2 m

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