Mach.
-- "Ze shpeed awf zount"-- "The thpeed of thound"
Mach 2
Acoustical energy is only the vibrations that make sound, so sound is another name.
The speed of sound is a Mach. 1 Mach for a particular medium is the distance that sound would travel through that medium in 1 second.
silence
The frequency of a sound wave does not affect the speed at which the wave moves. The speed of sound in a medium is determined by the properties of that medium, such as its density and elasticity. However, frequency does impact the pitch of the sound we hear.
Density.Temperature.Pressure.
Another name that can be used to refer to sound energy is vibration energy
Lagoon
the sound barrier
Concorde
the Concord