Solving for Distance or Radius from Point Source

power (P _{av})=0 =0 watt |

sound wave intensity (I) =0 =0 watt/meter^2 |

distance or radius from point source (r) =NOT CALCULATED |

Select an equation to solve for a different unknown

Where

SPL | = | sound pressure level, decibels (db) |

P | = | sound wave pressure, newtons/meter^{2} |

P_{ref} |
= | reference pressure or hearing threshold, newton/meter^{2} |

IL | = | intensity level, decibel (db) |

I | = | sound intensity, watt |

I_{0} |
= | reference intensity or least audible sound level, watts |

P_{AV} |
= | average power, watt |

NPL | = | noise pollution level, decibel (db) |

Notes:

- Usually, I

- Usually, P

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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