What is Propagation of Sound Waves in Physics

Propagation of Sound Waves

 

When a body vibrates in air, it produces longitudinal waves by compressions and rarefactions. These compressions and rarefactions are traveled by the particles of the medium and transferred into the next particles. Due to this transference, sound propagates in a medium.

 

Experiment:

Suspend an electric bell in a jar by its wires through a cork fixed in its mouth. Switch on the bell; we will hear the sound of the bell. Now start removing air from jar with the help of an exhaust (vacuum) pump, the sound will decrease, although the hammer is still seen striking the bell. This experiment shows that air or any other medium is necessary for the propagation of sound.

 

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