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*A silencer also known as a muffler and works on the principle of "Destructive Interference".

*"Destructive Interference" is a topic which we usually learn in our graduation, in this topic two waves actually superimpose each other in such away that they get cancelled.

* It consists of tubes which absorb the sound waves coming from the internal combustion engine and reflect them back with a phase difference of 180.Due to which the sound waves undergo what is called "Destructive Interference" and finally nullify each other.

*But yet not all of the sound waves under "Destructive Interference" and hence there is always some amount of sound that we hear.

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