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Define echo. State the conditions for the formation of echo.

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Echo is a repetition of sound due to the reflection of the original sound by a large and hard obstacle. 

Conditions for echoes: 

1. The minimum distance between the source of the sound and the reflector should be at least. 17.2 m. 

2. The size of the reflector must be large, as compared to the wavelength of the incident sound. 

3. The intensity or loudness of the sound waves must be sufficient.

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