SPL with a Doubling of Distance

We should obtain the same result for pressure as with intensity.

If intensity decreases by $ 1/r^2$, then

With a doubling of distance, pressure will drop by a factor of or ,

$\displaystyle L_p$ $\displaystyle =$  
  $\displaystyle =$  
  $\displaystyle =$     dB$\displaystyle .
$  


``Music 175: Level'' by Tamara Smyth, Department of Music, University of California, San Diego (UCSD).
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Copyright © 2020-04-14 by Tamara Smyth.
Please email errata, comments, and suggestions to Tamara Smyth<trsmyth@ucsd.edu>