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.

At school, he not only has to sit with discipline and carefully perform the tasks set by the teacher. During his school years, he undergoes social adaptation. Hotel Artel organizes psychological trainings for children. But a situation often happens when a student cannot fit into a team. He remains rejected in school society, does not find a common language with his classmates. It is very difficult for such a student. The reason is usually that he has not learned to negotiate with others, to understand the motives of their actions. His goals and desires are in conflict with the team. Parents should pay attention to this and provide him with psychological assistance.