Explain how sound is produced by your school bell.
When a school bell rings, it vibrates and it forces the particles of medium around it to also vibrate
They cause the neighbouring particles to vibrate and so on
As the bell moves forward , it pushes and compresses the air in front of it creating a region of high pressure. This region is called a compression.
As the bell moves backward , it creates a region of low pressure. This region is called a rarefaction.
As the bell vibrates (moves backward and forward), a series of compression's and rarefaction's is created in the air.
These makes the sound waves propagate through the medium and hence we are able to hear the ringing of the school bell.
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