anons been askin':
''Underwater Sound Propagation''
The speed of a wave is the rate at which vibrations move through the medium. Sound moves at a faster speed in water (1500 meters/sec) than in air (about 340 meters/sec) because the mechanical properties of water differ from air. Temperature also affects the speed of sound (e.g. sound travels faster in warm water than in cold water) and is very influential in some parts of the ocean. Remember that wavelength and frequency are related because the lower the frequency the longer the wavelength. More specifically, the wavelength of a sound equals the speed of sound in either air or water divided by the frequency of the wave. Therefore, a 20 Hz sound wave is 75 m long in the water (1500/20 = 75) whereas a 20 Hz sound wave in air is only 17 m long (340/20 = 17) in air.
https://oceanexplorer.noaa.gov/explorations/sound01/background/acoustics/acoustics.html
https://oceanexplorer.noaa.gov/explorations/sound01/background/acoustics/media/sofar.html
video: Underwater Acoustics
The Institute of Marine Engineering, Science and Technology
https://www.youtube.com/watch?v=FYk1tbTKkVI
Another video: Physics of Underwater Sound
OceanTrackingNetwork
https://www.youtube.com/watch?v=DW5EDSZ3xz0
Also see Pressure Waves, Shock Waves and Steam Explosions.