Sound Wave Equations Calculator

Science Physics Formulas


Solving for Noise Pollution Level NPL in db(A)
Noise Pollution Level NPL in db

Inputs:

dB(A) level exceeded 10 percent of time (L10)
dB(A) level exceeded 50 percent of time (L50)
dB(A) level exceeded 90 percent of time (L90)


Conversions:

dB(A) level exceeded 10 percent of time (L10)
= 0
= 0
decibel
dB(A) level exceeded 50 percent of time (L50)
= 0
= 0
decibel
dB(A) level exceeded 90 percent of time (L90)
= 0
= 0
decibel

Solution:

noise pollution level NPL in dB(A)
= NOT CALCULATED

Other Units:


Change Equation
Select to solve for a different unknown
sound pressure levelsound pressure level
sound pressuresound pressure
reference pressurereference pressure
sound intensity levelsound intensity level
sound intensitysound intensity
reference intensityreference intensity
intensity at a distance from point sourceintensity at a distance from point source
distance from sound sourcedistance from sound source
power emittedpower emitted
wave frequencywave frequency
wave velocitywave velocity
wavelengthwavelength
noise pollution level NPLnoise pollution level NPL
Where
SPL=sound pressure level, decibels (db)
P=sound wave pressure, newtons/meter2
Pref=reference pressure or hearing threshold, newton/meter2
IL=intensity level, decibel (db)
I=sound intensity, watt
I0=reference intensity or least audible sound level, watts
PAV=average power, watt
NPL=noise pollution level, decibel (db)

Notes:
- Usually, I0 is set to 10-12 watts
- Usually, Pref is set to 0.00002 newtons/meter2
References - Books:
1) P. Aarne Vesilind, J. Jeffrey Peirce and Ruth F. Weiner. 1994. Environmental Engineering. Butterworth Heinemann. 3rd ed.
2) Tipler, Paul A.. 1995. Physics For Scientists and Engineers. Worth Publishers. 3rd ed.
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