Question

The amplitude of a sinusoidal sound wave is quadrupled.
a) By which factor is its intensity multiplied?
b)By how many decibels does the sound intensity level increase?
Intensity is proportional to amplitude square (power is force times speed and both are doubled) so 4

10 log I2/I1 or 20 log A2/A1
20 log 2 = 6 Db

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