Question

How far from a cliff should a boy stand in order to hear the echo of his clap 0.6second later?(speed of sound in the air=330m/s)

Answer 1

EXPLANATION:-

GIVEN:-

1. Time taken
2. Speed of sound

TO FIND:-

The distance b/w cliff and boy

STEP BY STEP EXPLANATION:-

We know:-

$\sf\;speed=\frac{distance}{time}$

Here speed=330 m/s

Distance=2d    [As the sound has also to come back to the boy or echo ]

Time=0.6 second

Let's put the data in the formula we get:-

$\sf\;330=\frac{2d}{0.6}\\\\330\times 0.6=2d\\\\198=2d\\\\d=\frac{198}{2}\\\\d=99$

Therefore,the distance has to be 99 metres