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  • A girl is sitting in the middle of a park of dimension 12 m × 12 m. On the left side of it there is a building adjoining the park and on right side of the park, there is a road adjoining the park.

A girl is sitting in the middle of a park of dimension 12 m × 12 m. On the left side of it there is a building adjoining the park and on right side of the park, there is a road adjoining the park. A sound is produced on the road by a cracker. Is it possible for the girl to hear the echo of this sound? Explain your answer.

Answers (1)

When we observe a sound directly or after reflection from any building, we call it an echo.

This echo can be heard or these two sounds can be distinguished, only if time gap between them is more than 0.1 second.

For this, separation between source and the wall must be more than 16 meter.

Assuming speed of sound = 320m/s

Distance between source and wall is d, then time to reach reflected sound will be:

t=\frac{2d}{V}

In the given case, the size of park is small. Therefore, it cannot cause any echo of the sound produced on the road.

Posted by

infoexpert24

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