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Sound Waves - The Decibel Scale

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This note describes the decibel scale and how to calculate the sound level of a sound in decibels

Note by ed.wilson89, updated more than 1 year ago More Less

	Created by leonie.examtime over 11 years ago

	Copied by ed.wilson89 over 11 years ago

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The Decibel Scale

The decibel scale is used to express the ratio between two values of a physical quantity, in this case, sound intensity

We use the equation $L_p$ = 20 log10 $\frac{prms}{pref}$ to calculate this ratio is decibels

Where Prms = is the sound pressure being measured and Pref = the reference pressure

To the right is a scale showing how loud certain values on the decibel scale are.

Decibel.gif (image/gif)

The Decibel Scale

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