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April 7th, 2015, 08:21 AM  #1 
Member Joined: Mar 2015 From: KY Posts: 35 Thanks: 1  Logarithmic Question
Not quite sure where to start here. I've studied the logarithmic properties but can't seem to decide on where to get started. Carl, the foreman at Atlantic Cycles, is concerned about noise levels in the factory. The Environmental Protection Agency has identified a maximum of 70 decibels to protect against hearing loss. The decibel is a logarithmic unit of measurement for loudness (intensity), and is defined as L=10log10(P/Po) where P is the sound pressure, and P0 is a reference level. What is the value of P/Po if L = 90? 
April 7th, 2015, 08:51 AM  #2 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,923 Thanks: 1122 Math Focus: Elementary mathematics and beyond 
$\displaystyle \frac{P}{P_0}=10^9$ Can you figure out why? 
April 7th, 2015, 01:41 PM  #3 
Member Joined: Mar 2015 From: KY Posts: 35 Thanks: 1 
Yep, got it now. Thanks 

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