Question

What is an echo? What factors are
important to get a distinct echo?​

Answer 1

Answer:

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Explanation:

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Answer 2

1) AN ECHO IS THE REPRESENTATION OF THE ORIGINAL SOUND BECAUSE OF REFLECTION BY SOME SURFACE.

2) AT 22°C, THE VELOCITY OF SOUND IN AIR IS 344 M/S.

3) OUR BRAIN RETAINS A SOUND FOR 0.1 s. THUS, FOR US TO BE ABLE TO HEAR A DISTINCT ECHO, THE SOUND SHOULD TAKE MORE THAN 0.1 s AFTER STARTING FROM THE SOURCE TO GET REFLECTED AND COME BACK TO US.

4) WE KNOW THAT,

DISTANCE = SPEED × TIME

= 344 M/S × 0.1 s

= 34.4 m

5) THUS, TO BE ABLE TO HEAR A DISTINCT ECHO, THE REFLECTING SURFACE SHOULD BE AT A MINIMUM DISTANCE OF HALF OF THE ABOVE I.E 17.2 m.

6) AS THE VELOCITY OF SOUND DEPENDS ON THE TEMPERATURE OF AIR, THIS DISTANCE DEPENDS ON THE TEMPERATURE.