Question

Numerical : Prove that the distance of reflecting surface should be at least 17m for an echo.

Answer 1

Answer:

Speed = distance travveled/time

speed of sound is 344 m per sec

distance=?

time =1/10

344=distance/0.1

distance = 344×0.1

=34.4

is is distance of going and coming

so 34.4/2=17.2

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