A boat floating in the sea, 300 m deep, medium wave, audio signal and 15E received resounding from the seabed in at 0.4 speed of sound in water is by how much.
One boat floating in the sea 300 meters away, the sound pulse transmitted and received signals reflected back from the seabed at 0.4 times the speed of sound in water as much.
A boat floats in the deep sea 300 meters send a pulse wave sound, go out and get the signal reflected back from the seabed at 0.4 speed of sound in water is much.