Question

a echo is returned in 3s.what is the distance of the reflecting surface from the source,cosidering the spèed of sound as 342m/s

Answer 1

Hello!

The sound's echo reaches you in 3 seconds, which means the sound has travelled at a speed of 342 m/s for 1.5 seconds, before it reflected.

so the distance will be:

342*1.5 = 513 metres!

Another way to do this is:

(342*3)/2 = 513 metres.

I hope this helps you.

With Regards,

Vishnu Vignesh