Answer: logarithmic response of the ear
Ear and brain is made such that equal factors in
intensity cause equal increments in loudness.
this is the DECIBEL SCALE of Sound Intensity Level:
Intensity level in dB:
(can be used to compare any two intensity levels
Intensity I: 1 10 102 103 104 ÖÖ..1010 1011 1012
log I : 0 1 2 3 4ÖÖÖ.. 10 11 12
10log I: 0 10 20 30 40 ÖÖÖ 100 110 120 dB
if we call threshold intensity = 1:
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