Question

a child hears an echo from a cliff 4 second after the sound of a powerful cracker is produced .how far is the Cliff from the child ? (take speed of the sound in air as 340 m/s )​

Answer 1

Answer:

6.8 km

Explanation:

As D = V × T / 2

therefore

D =340 × 4 / 2

=340 × 2

=680 m

=6.8 km

Answer 2

Explanation:

TIME TAKEN FOR ECHO TO RETURN = 4 SECONDS

SPEED OF SOUND GIVEN = 340m/s

DISTANCE OF CLIFF FROM CHILD=

\frac{340 \times 4}{2} = 680m

THEREFORE,

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DISTANCE OF CLIFF FROM THE CHILD IS 680 METERS.

I hope this is help you...