Question

two imp. condition for production of an echo ​

Answer 1

Answer:

The conditions necessary for hearing the echo . The distance between the sound source and the reflecting surface must not be less than 17.2 metres where the time period between hearing the original sound and its echo should not be less than 0. 1 of a second .

Explanation:

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Answer 2

1) temperature increase can increase speed so there will be no echo

2) the distance between the source of sound and the object must be 17.2 m