28th November 2019

wikipedia
15

What is the formula for dB?

The base-10 logarithm of the ratio of the two power quantities is the number of bels. The number of decibels is ten times the number of bels (equivalently, a decibel is one-tenth of a bel). P and P0 must measure the same type of quantity, and have the same units before calculating the ratio.

How loud is 20 decibels?

Comparitive Examples of Noise Levels
Noise SourceDecibel LevelDecibel Effect
Library, bird calls (44 dB); lowest limit of urban ambient sound40One-eighth as loud as 70 dB.
Quiet rural area.30One-sixteenth as loud as 70 dB. Very Quiet.
Whisper, rustling leaves20
Breathing10Barely audible

What is 1 dB?

Alternative Title: dB. Decibel (dB), unit for expressing the ratio between two physical quantities, usually amounts of acoustic or electric power, or for measuring the relative loudness of sounds. One decibel (0.1 bel) equals 10 times the common logarithm of the power ratio.
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