The decibel scale is:
a. linear: Three decibels minus two decibels equals one decibel.
b. proportional: Three decibels is the square of two decibels, and four decibels is the square of three decibels.
c. logarithmic: Two decibels is ten times one decibel; three decibels is ten times two decibels.
d. inverse: A two decibel sound is half as loud as a one decibel sound.
e. logarithmic by tens: Ten decibels is ten times one decibel; twenty decibels is one hundred times ten decibels.
e
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