Question

What is ECHO? ............

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Answer 1

Answer:

An echo can be defined as the sound that is heard by the observer after it is reflected from a rigid surface. Echo is a common occurrence in mountains and various where the sound emitted from the source strikes the mountains and returns to the source after a certain interval of time.

Explanation:

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Answer 2

Answer:

a sound that is repeated as it is sent back of a surface such as a wall of a tunnel is called echo