Question

A boy standing in front of a wall at a distance of
85 m produces 2 claps per second. He notices that
the sound of his clapping coincides with the echo.
The echo is heard only once when clapping is
stopped. Calculate the speed of sound,
​

Answer 1

340m/s

Explanation:

distance=85m

time taken to be heard

T=1÷2s=0.5s

If (d) is distance between the boy and wall then, total distance traveled by sound in going and coming back

=2d

now

distance=speed of sound *time

speed=2d÷time=2*85÷0.5=340m/s

Answer 2

Answer:

Here, distance of the boy from the wall,

<br> time taken by the echo to be heard,

<br> If

is distance between the boy and the wall, total distance travelled by sound in going and coming back

<br> As distance travelled by sound = speed of sound xx time, <br>

or

hope it helps you..