Physical mechanism of sound:
Air is compressed by a pulse, e.g. from a speaker.
This creates areas of compression within an air column.
Repeated pulses create a wave.
Sound is longitudinal wave
Air
is carrier of sound wave.
Without air, there is no sound.
Wavelength of Sound Waves
Consider sound waves with speed
a)
b)
Audible sound frequencies
Range from 20 Hzto 20,000 Hz(=20 kHz)
f < 20 Hz : infra sonic
f > 20 kHz : ultra sonic
Ultra sound : Many applications
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