Why do we prefer to express the gain in decibel?

1.	Why do we prefer to express the gain in decibel?
Answer» (i) Loudness heard by human ear is according to the logarithm of the intensity of sound. (ii) In multistage amplifiers, total gain in decibel is equal to the sum of the decibel gains of individual stages.

Answer»

(i) Loudness heard by human ear is according to the logarithm of the intensity of sound.

(ii) In multistage amplifiers, total gain in decibel is equal to the sum of the decibel gains of individual stages.

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