Audiography Class Notes
11/June/2015
SOUND
Sound
is produced when an object vibrates and causes the air around the move. Vibration
is the back and forth movement of an object. Its like pulsating sphere
radiating spherical waves. As it pulsates it will alternately compress and then
rarely the surrounded air.
Characteristics of sound wave
The
rate at which the source oscillate is the frequency of the sound wave it
produces. and it quoted in Hertz (Hz) or EPS - Cycle per second.
Amplitude:- is the amount of compression and rare
fraction of the air which results from the sphere's motion is the amplitude of
the wave.
Distance between two adjacent peaks of the
compression or rare fraction as the wave travels to the air is the wave length
of the sound wave. And it is represented by lambda ( λ).
Air made up of gas olecules and it has an elastic
property.
Longitudenal Waves
In this type of wave, the particle displacement is
parallel to the direction of the wave propagation.
TRANSVERSE WAVE
in this, particle displacement is parallel to direction
of wave propagation.
18/June/2015
Speed of sound
The speed at which it moves away from the source
depends on the density and elasticity of the substance through which it passes
and in air the speed is relatively slow compared with the speed at which sound
travels through most of the solids. In air, the speed of sound is approximately
340 m/
C = Fλ
s. In solid, it is 5100 m/s.
SIMPLE AND COMPLEX SOUND
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