Question

Sound is produced when your school Bell is struck with a hammer why

Answer 1

or
vibration in an object creates disturbance in medium hence compression and rarefaction occurs due to these compression and rarefaction sounds reaches our ears...
I hope that this will be helpful to you

Answer 2

When school bell is strucked it produces a vibration and its nearby atmospheric particles come into motion and starts making waves and this sound travel to our ear which we heard