Please explain HOW to solve, answers are nice, too!
What is the intensity in w/cm2 of a sound that has a relative intensity of 30 db?
The intensity of a sound is 10 to the -14 w/cm2. What is the relative intensity?
2007-03-09 03:09:56 · 1 answers · asked by Michael n 2 in Science & Mathematics ➔ Mathematics
The formula that you need is this one:
L = 10 * log10( I / Io )
where:
L is the (relative) sound intensity level (dB-SIL, or dB for short)
I is the sound intensity (W/m^2, or alternatively W/cm^2)
Io is the reference intensity for the db-SIL scale.
Io = 10^-12 W/m^2, or equivalently...
Io = 10^-16 W/cm^2
The sound with relative intensity of 30 dB has an intensity of 10^-13 W/cm^2
The sound with intensity of 10^-14 W/cm^2 has a relative intensity of 20 dB
2007-03-09 07:07:15 · answer #1 · answered by Bill C 4 · 0⤊ 0⤋