What is sound?
Sound is a mechanical wave which results from the back and forth vibration of the particles of the medium through which the sound wave is moving. If a sound wave is moving from left to right through air, then particles of air will be displaced both rightward and leftward as the energy of the sound wave passes through it. The motions of the particles are parallel (and anti-parallel) to the direction of the energy transport. This is what characterizes sound waves in air as longitudinal waves.
How is sound being produced?
Sound are produced by the vibration of object . Sound is a physical entity, unlike noise which is the perception of sound. Sound is an high pressure wave front through a medium (such as air, or a liquid such as water, or a solid), wherein the wave front is followed by a reciprocal pressure differential behind it. Sound is produced when something disturbs the medium and sets in motion the molecules in the medium.
What affects sound?
One thing that can propagate sound is if you were to place something of which emits sound in a vacuum. The sound waves will propagate in the vacuum, because the matter which supports the sound called the medium no longer exists.
Source, http://en.wikipedia.org/wiki/Sound
Examples of stuff producing sound .
There are many things that can produce sound
Examples are radios , television , printers , fans .
What did I learn about the particular topic ?
I learn that sound is part of our life as it is everywhere . When we cough , a sound is made . When we talk or laugh with our friends , a sound is made . So it is very common to have sound everywhere .
Key points of the topic
Sound is a form of energy .
Are produced by the vibration of objects .
Sound travels through matter-solids, liquids and gases . Sound cannot travel through a vacuum .
Sources : Textbook resource , Source, http://en.wikipedia.org/wiki/Sound
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