Question

А
man
요
gun
The first echo after a second and
standing between two cliffs fires a
the next echo after 5 seconds. What is
his position between the two clips?
When
hear the third echo?
Speed of
the
sound is air is 340m/s. .
will be
​

Answer 1

Answer:

If the man plays a sound, then the sound waves travel towards the cliff, get reflected, return and then fall on his ear. This is how he hears an echo.

Thus the sound travels twice the distance between him and the cliff.

∴distance(s)=

2

speed×time

∴s=

2

330×2

=330 metres

Thus 330 metres is the distance between him and the 1st cliff.

Since he hears the 2nd echo after the same time interval, the 2nd cliff is also at a distance of 330 metres from him.

Hence the distance between the 2 cliffs will be 330+330=660m.