How much bigger it will be the temperature of a gas, greater the speed with that the sonorous wave in it if propagates. In fact, the agitation of molecules of a gas increases with the temperature, making with that the propagation of the sonorous wave is faster. The speed of propagation of a wave depends on the way in which it is if propagating and this she also occurs with the sound, for example: in the water the sound if propagates with a speed of 1.450m/s, in the iron with a speed 5,100 m/s. A sonorous wave if reflects in such way that the angle of the incidence is equal to the angle of reflection and some phenomena as the echo are caused by the reflection of the sound. The reflection phenomenon also occurs as sound when a sonorous wave passes obliquely of a way for another one, it has its direction of modified propagation the relation y=v/f is valid for the sonorous waves and the frequency of a sound does not get excited where it passes of a way for another one. intensity of the sound the intensity is a property of the sound that is related with the energy of vibration of the source that emits the sonorous wave. If propagating, the wave carries this energy, distributing it In all the directions.

How much bigger it will be the amount of energy that the sonorous wave to carry until our ear, greater will be the intensity of the sound that we perceive. The intensity of a sound is in such a way bigger how much it will be the amplitude of the sonorous wave. The intensity of the sound is measured in a called unit 1 bel. In the practical one, one is used more comumente submltiplo of this unit: 1dBz=0,1 bel. The sounds of great intensity in a generalized manner are ackward to human ear e, as (it shows) when reach an intensity next to 140 dB, start to produce sensations painful.

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