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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: 7,935 Thanks: 1129 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 Thanks from greg1313

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### "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 "

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