131 Generation of acoustic waves by loudspeaker

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=HGAIPXnBKJE

http://physics-animations.com/Physics... • The sensation of sound appears due to mechanical oscillation of eardrum. This oscillation is excited by acoustic wave propagating from the source of sound to the ear. Any vibrating object generates the acoustic wave, but we can hear only the sound with the frequency in the range 20 Hz- 20 kHz. The sound with the higher frequencies (ultrasound) and lower frequencies (infrasound) can be detected by special devices. Let us consider the process of the sound generation by loudspeaker. The alternating current being applied to the loudspeaker causes the mechanical oscillation of a coil connected with cone of the loudspeaker. As a result of this oscillation some regions of the air turn out to be compressed, while the other regions are rarefied. The regions with excessive pressure are propagating in the space in the form of longitudinal waves. When such a wave reaches the ear, it forces the eardrum to be oscillated and we hear the sound.

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