Audiography I

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