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A sound is a form of energy. It is passed from one point to another like a wave. It is an example of longitudinal waves. The sound is created by vibrating sources placed in a medium. A vibrating object in the air causes shifting of layers of air particles. Longitudinal sound waves are produced.

The direction of vibration of air molecules is parallel to the direction of wave motion.

Wavelength is the distance between the centers of two adjacent compressions or rarefactions. As sound is a longitudinal wave, it travels in a series of compressions and rarefactions. Compression is a region where the air pressure is higher than the surrounding. Rarefaction is a region where the air pressure is lower than the surrounding.

Sound waves travel at a speed of about 340 m/s in the air. Sound cannot travel through vacuum since there is no medium to carry the waves. Sound can travel through solids and liquids: in fact, sound travels faster in solids than in liquids and gases. The speed of sound depends on Temperature (Speed increases with temperature), Material (Speed increases with density) and Humidity (Speed increases with humidity).

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