Introduction 

All of you are familiar with the term 'sound', right!

You might have heard the chirping of birds, the rustling of leaves, the honking of vehicles, the melody of flute or any musical instrument i.e. guitar, harmonium, tabla, dhol, the whistle of train, the bell of a cycle, the alarm clock, etc. We perceive all such sounds through our hearing sense, with the help of organ-ear.

Let us explore and understand the sounds that we hear. What is sound? How is it produced? How does it travel?