one-tenth of the bel
NOTE 1 – The decibel is more often used than the bel as a unit of level.
NOTE 2 – The decibel can be defined as a unit of level of a power-like quantity when the base of the logarithm is the tenth root of ten. Also, the decibel is the unit of level of a field quantity when the base of the logarithm is the 20th root of ten.
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