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Sound is a mechanical wave and needs a material medium like air, water, steel etc. for its propagation.
A medium is the substance or material through which a pulse or a wave moves.
1. How does the sound produced by a vibrating object in a medium reach your ear?
Ans: When an object vibrates, it forces the neighbouring particles of the medium to vibrate. These vibrating particles then force the particles adjacent to them to vibrate. In this way, vibrations produced by an object are transferred from one particle to another till it reaches the ear.
LONGITUDINAL AND TRANSVERSE WAVE
A longitudinal wave is a wave where the particles in the medium move parallel to the direction of propagation of the wave.
“If the particles of a medium vibrate in a direction, parallel to or along the direction of propagation of wave, it is called longitudinal wave”
Sound waves are pressure waves caused by objects which are vibrating. Sound waves need a medium through which to travel.
A compression is a region in a longitudinal wave where the particles are closest together. A rarefaction is a region in a longitudinal wave where the particles are furthest apart.
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