# Find the level of sound

• November 21st 2009, 03:22 PM
VNVeteran
Find the level of sound
the level of sound B in decibels with an intensity of I is B=10log(I/I0) where I0=10^-12 watt/m^2, correspondingly roughly to the faintest sound that can be heard by the human ear. Find the level of sound B of a snowmobile with I=10^-2 watt/m^2.
• November 21st 2009, 09:35 PM
alexmahone
Quote:

Originally Posted by VNVeteran
the level of sound B in decibels with an intensity of I is B=10log(I/I0) where I0=10^-12 watt/m^2, correspondingly roughly to the faintest sound that can be heard by the human ear. Find the level of sound B of a snowmobile with I=10^-2 watt/m^2.

$B=10\ log(\frac{I}{I_0})$

$B=10\ log(\frac{10^-2}{10^{-12}})$

$B=10\ log(10^{10})$

$B=10*10$

$B=100\ decibels$