- #1
joe215
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Homework Statement
What is 80dB+75dB?
I found the individual intesities to be 0.0001 and .0000316228
Then I added them and:
dB=10log(1.31622x10^-4/1x10^-12)=81.19 dB
Is that right?
Thanks!
A decibel (dB) is a unit of measurement used to express the intensity or loudness of a sound. It is a logarithmic unit that compares the sound pressure level to a reference level.
The decibel scale is calculated using logarithms. The formula is: dB = 10 log (P/P0), where P is the measured sound pressure level and P0 is the reference level.
The reference level for sound is 0 dB, which is the threshold of human hearing. It is equivalent to a sound pressure level of 20 μPa (micropascals).
The decibel scale is logarithmic, meaning that a change of 10 dB represents a tenfold change in sound intensity. For example, 80 dB is 10 times louder than 70 dB.
dB(A) and dB(C) are weighting scales used to measure sound levels. dB(A) is the A-weighted scale, which takes into account human perception of sound and is commonly used for environmental noise measurements. dB(C) is the C-weighted scale, which measures all frequencies equally and is used for industrial noise measurements.