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Sound is a longitudinal and mechanical wave that propagates in material media such as air, water, metal, etc. It is produced by vibrations capable of creating areas of compression and rarefaction in atmospheric gases that alternate according to the frequency of the source. The speed of propagation of sound waves is determined by the elasticity of the medium, being greater the more elastic it is. Sound has properties such as speed, wavelength, frequency and amplitude. The Doppler effect, in turn, is the increase or decrease in the apparent frequency of a sound due to the relative motion between a sound source and an observer. We can calculate the speed of sound if we know its frequency and wavelength.
