<PRE><B>Question 303538</B>
The loudness L of a sound measured in decibles (db) is given by the formula: L=10*log (I ÷ I0) where I repesents the intensity of the sound measured in watts per square meters and Io = 10^-12. 
The loudness of certain sound measures 30 db. If the intensity of the sound is multiplied by 10, what is the loudness in decibels of the new sound? 
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L = 10*log (I/Io)
30 = 10*log(I/10^-12)
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3 = log(I/10^-12)
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I/10^-12 = 10^3
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I = 10^-12*10^3
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I = 10^-9
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