Frequency = number of oscillations per second, measured in Hz (Hertz)
Amplitude = max. extent of the wave’s displacement from its rest position / intensity of the density fluctuation
Period = duration of one oscillation
Sound requires a medium (solid, liquid or gas) with a certain mass and elasticity. It is these factors as well as the temperature that influence the speed at which sound propagates.
Air at 20°C = 343m/s
Helium at 20°C = 1005m/s
Sea water at 20°C = 1560m/s
Diamond at 20°C = 17500m/s
Speeds in comparison:
Fastest human = 10m/s=36km/h
Formula 1 Car = 100m/s=360km/h
Sound in air = 343m/s=1234,8km/h
Light = 300,000,000 m/s
... the speed of sound in air at 20 degrees is 343 meters per second and in sea water at 1560 meters per second – that‘s more than four times the speed!