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.
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.
Note: Why should a child learn any millionaire? Already now he has all the material benefits, and in the future they are unlikely to go anywhere. It is clear that there is no such motivation for such well-to-do students. But why do such elitist parents generally send their children to study, then choose the best schools for them and at times spend whole states on learning descendants? Naturally, they are not driven by sadistic inclinations and generally do not want to torment their child. But the fact is that often among millionaires all people are just as fit for selection, many of them have earned their fortune legally, with their own hands. So they understand that if from childhood a person does not have any resistance in life, then this is a direct way to complete degradation of the person.