Explain how sound is produced by your school bell
A school bell begins to vibrate when it rings. These vibrations cause the surrounding air particles to move as well.
The bell pushes the air in front when it advances, therefore compressing it into a high-pressure area.
A backward-moving bell creates a low-pressure zone known as rarefaction.
Many compressions and rarefactions in the air are produced as the bell continues to vibrate back and forth. Traveling as sound waves through the air, these reach our ears and ring the school bell.