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light is a electro-magnetic wave in which the magnetic and electric fields causes generation of one other and they are not transversal waves, also they can travel in a medium and without a medium( in vaccum or space) ie our radio signals, light waves ettc..

but on other hand the sound waves require a medium to travel, indeed the sound energy propagates by a kind of disturbance that is produced when molecules viberating in their normal frequencies start to viberate with more displacement and this causes collision and transfer of energy to neighbouring molecules and the continuity of the process restricts the speed with which this disturbance is travelling.

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