Question 23372
Use your Google search to look at "Sound frequency decibel"
separately or in combination.
Human sound is between 20hz and 20khz.
For example, for a frequency of 45hz the sound wave formula is 
y = sin [(2pi/45)x].
Intensity of sound expressed in dB = 10log [(sound intensity/threshold ]intensity). The threshold is a certain level of intensity that physicists
use as a measuring unit to determine the dB measurement of a sound they
are studying.
For example a Rock Concert has been measured as having a dB level between
102 and 106 dB
Put that 102 into the formula and you get the following:
 102dB =10log[Intensity/threshold]
10^101 = Intensity/ threshold
Sound intensity of the concert is (10^101)*(threshold intensity)
That is LOUD.

Cheers,
Stan H.