Question

4) Calautente minimun distance
of veflector for echo.
teater
bodies (ispead of
sound in water = +0 1500ml)
us.​

Answer 1

Answer:

When a sound wave travels in a medium and get reflected back from the reflecting surface, we hear an echo.

The sound wave must travel a minimum distance so that we can hear an echo. Considering the speed of sound in air as 340m/s, the minimum distance between the source of sound and reflecting body is 17.2 metres.

Answer 2

Answer:

For example, if the speed of sound in water is 1500 meters per second and the fisherman's sonar device detects an echo in 0.02 seconds, the distance of the object under water will be d = v*t = 1500 meters per second * 0.02 seconds = 30 meters (back and forth)