Question

what is echo. define it with it,s SI unit​

Answer 1

Hii,Bro

Echo sounding is effectively a special purpose application of sonar used to locate the bottom. Since a traditional pre-SI unit of water depth was the fathom,an instrument used for determining water depth is sometimes called a fathometer

Hope this will helps u bro

Answer 2

Answer:

Explanation:

echo is a reflection of sound that arrives at the listener with a delay after the direct sound. The delay is directly proportional to the distance of the reflecting surface from the source and the listener.

SI unit​=Decibels