Rev. Notes > IGCSE > Sound Previous Topic Sound Next Topic Topics
 Nature of sound waves Experiment: Sound can not travel through vacuum Production of sound Characteristics of sound Medium to transmit sound waves Speed of sound in different media Echo Audible frequency range

## Speed of sound in different media

Speed of sound in air:

Sound wave have a definite velocity of propagation in a given medium. A thunder of a cloud is usually heard a few seconds after lightning flash is seen. When a distant gun is fired, the flash of discharge is seen some time before the sound is heard. the time interval between the event occuring and it being heard by the observer is simply due to high velocity of light as it reaches the observer almost instantaneously.

The simplest way of finding the velocity of sound is by arranging for a gun to be fired at a measured distance from an observer who measures the time between seeing the flash and hearing the sound. By using the following relation speed of sound can be measured

Speed (v) = distance (s) / time(t)

The velocity of the sound in air at 0o C is 331.4 m / s. the velocity of sound increases with the increase in temperature.

Experiment: Sound cannot pass through vaccum

 Medium Speed of sound Rubber 60 m/s Air at 0 oC 331.4 m/s or 332 m/s Air at 40 oC 355 m/s Air at 20 oC 343 m/s Lead 1210 m/s Gold 3240 m/s Glass 4540 m/s Copper 4600 m/s Aluminum 6320 m/s At absolute zero 0 m/s