The speed is directly proportional the temperature and inversely proportional to the modulus of elasticity of meio.' ' (HENEINE, 2005, P. 324) In biological fabrics, as well as it occurs in the water, the sound is presented with ondulatrios movements due to the increase of kinetic energy of molecules of the way, what it facilitates the material disturbance. REFLECTION OF the SOUND For HENEINE (2005, P. 325) when has a surface that the propagation of the sound is opposed, dumb it of direction, with equal angle of incidence to the one of the reflection. The reflection of the sound also is the beginning of the sonar and of the biological exploration through ultrasound. DIFRAO OF the SOUND Is described as being the capacity that the waves possess to skirt the obstacles.
For example, for a half-opened door it passes much sound and noise. INTERFERENCE Is responsible for the loss of the discrimination of sounds and noises, that is, the increase or reduction of the intensity of the sound, which had to the somatrio of the wave pulses. DOPPLER EFFECT Is the change apparent of frequency, when relative movement between sender and receiver exists, either if approaching or if moving away one from the other. In this in case that, the Vr frequency of the receiver is not same that the Vo frequency of the wave in fon you. We can observe this phenomenon in buzzers of ambulances. This effect is used to determine the speed of the sanguineous circulation, using waves reflected for the blood that if moves away. AUDITORY DEVICE Is the set of subsystems that the capacity has to transform external stimulatons of physical origin (mechanical waves) into internal electric impulses, that finish acting on cells ciliadas and its nerves terminals, being sent to the brain, that codifies the initial stimulaton mechanical, causing the hearing sensation. Thus being, we can say that the human ear is an extremely sensible agency, capable to convert until the lesser mechanical stimulaton, produced in a external way.