What is the meaning of decibel?

Answer:
Decibel with the abbreviation dB is equal to one-tenth of a bel, after Alexander Graham Bell. It is a measuring system first used in telephony in 1929.

It is a logarithmic unit of measurement that expresses the magnitude of a physical quantity, usually power or intensity, relative to a specified or implied reference level. Since it expresses a ratio of two quantities with the same unit, it is a dimensionless unit.

First answer by JensR. Last edit by JensR. Contributor trust: 125 [recommend contributor recommended]. Question popularity: 1 [recommend question].

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