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1. Sound is a form of energy.
2. It is produced by vibrating objects or bodies.
3. Sound waves are longitudinal waves.
4. It needs medium to travel.
5. The speed of sound is different for different medium.
6. The speed of sound is 332 m/s in air at 0
⁰ C.

Types of sound:
Its mainly of following types on the basis of frequencies:
1. Audible Sound waves
2. Infrasonic Sound waves
3. Ultrasonic Sound waves

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Vibrations that travel through the air or another medium and can be heard when they reach a person's or animals ear

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