week 7a

# week 7a - Physics 1240 Today Loudness versus pitch Next...

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Physics 1240 Tues 2/22/11 Today: Loudness versus pitch Next time: Human ear and hearing Outline - Quick review intensity and SIL/dBs - Adding intensities - Physical versus psychological - Loudness scaling - Loudness versus pitch - Sones versus phones - More on the audible range and hearing loss

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Intensity (W/m 2 ) SIL (dB) Example 10 -12 0 dB Inaudible 10 -11 10 dB Pin drop 10 -10 20 dB Recording studio 10 -9 30 dB 10 -8 40 dB Library 10 -7 50 dB City of Boulder nighttime noise ordinance 10 -6 60 dB Conversation 10 -5 70 dB 10 -4 80 dB 10 -3 90 dB Subway Train See Table 6.1 in Hall Text
level difference in dB = 10 x log( I 2 / I 1 ) I 0 = 1x10 -12 W/m 2 SIL (dB) = 10 x log( I / I 0 ) Last time…

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CQ 7.1 Suppose your singing voice has an intensity (in W/m 2 ) 3 times Blaze Vincent’s. How much higher is your SIL level in dBs? A) 10 log(3) = 4.8 dB B) 3 dB C) 30 dB D) 10 log(30) = 14.8 dB
You cannot argue physics with a complete stranger! So .

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week 7a - Physics 1240 Today Loudness versus pitch Next...

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