Unit of sound/noise is decibels

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Hi all,i am extremely sorry that i am asking a very basic question,The unit of sound/noise is decibels,but unit of attenuation is also decibels/length, so how it could be possible as two are different things.
 
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I don't understand your question. You have two different quantities, each with its own units. Decibels is not the same as decibels/length.
 

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