Sound Wave Equations Calculator
Science Physics Formulas
Problem:
Solve for Noise Pollution Level NPL in db(A)
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Solution:
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 | sound pressure level |
 | sound pressure |
 | reference pressure |
 | sound intensity level |
 | sound intensity |
 | reference intensity |
 | intensity at a distance from point source |
 | distance from sound source |
 | power emitted |
 | wave frequency |
 | wave velocity |
 | wavelength |
 | noise pollution level NPL |
| 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:
P. Aarne Vesilind, J. Jeffrey Peirce and Ruth F. Weiner. 1994. Environmental Engineering. Butterworth Heinemann. 3rd ed.
Tipler, Paul A.. 1995. Physics For Scientists and Engineers. Worth Publishers. 3rd ed.
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