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Is Matter Around Us Pure

Question
CBSEENSC9006600
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What are multiple echoes? Give examples.

Solution

The successive reflection of a sound wave from a number of obstacles, causes us to hear echo of the sound transmitted one after other. When a sound is repeatedly reflected between two parallel distant buildings or cliffs, multiple echos are produced. 

For example, rolling of thunder is due to successive reflections between clouds and land surfaces. 

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