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Echo is one of the phenomena of reflection of sound. When we go to the mountain top and shout loudly, we hear our own sound after sometime. What should be the minimum distance of the object for the echo to occur?

(a.) 10 m

(b.) 15 m

(c.) 20 m

(d.) 50 m

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The correct option of this question is (B).

Explanation : The minimum distance for echo to occur is 15 m.

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