An anchored fishing boat used sonar to work out how deep the sea is. It sends out a Ping of sound and detects the echo 2 seconds later
How deep is the water??
![An anchored fishing boat used sonar to work out how deep the sea is It sends out a Ping of sound and detects the echo 2 seconds later How deep is the water class=](https://us-static.z-dn.net/files/d5c/c5e51328f2cc7c74fe39da9c6377bb8a.jpg)