Question

What is an echo? What are the necessary conditions for its occurrence?
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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 metres where the time period between hearing the original sound and its echo should not be less than 0.1 of a second .

Answer 2

Answer:

AN ECHO IS A REPETITION OF SOUND PRODUCED BY THE REFLECTION OF SOUND WAVES FROMA REFLECTING SURFACE.

MINIMUM DISTANCE FOR AN ECHO IS 334*0.1s =34.4s 34.4/2=17.2m IS THE MINIMUM DISTANCE REQUIRED.

Explanation:

1)AN ECHO CAN BE HEARD ONLY WHEN-:

THE MINIMUM DISTANCE IS 17M.

2)THERE US A HIGH WALL OF MOUNTAIN OR A HIGH BUILDING,WHICH CAN ACT AS A REFLECTING SURFACE.

3)THE SOUND IS LOUD ENOUGH SO THAT IT REACHES THE RECEIVER AFTER REFLECTING.

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