document.write( "Question 73794This question is from textbook college algebra
\n" ); document.write( ": My daughter has to do a paper on this topic and doesn't know where to begin. Any info would be appreciated:)\r
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\n" ); document.write( "\n" ); document.write( "The loudness of sound is based on intensity level measured in decibels using a logarithmic scale and is relative to (a ratio of) the weakest sound the ear can hear.\r
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\n" ); document.write( "\n" ); document.write( " what's the formulaused for measuring sound.
\n" ); document.write( "can you give a specific sound, give the decibels of the sound, and explain what this measurement means.\r
\n" ); document.write( "\n" ); document.write( "Thanks a bunch!!Any input would help her a great deal..she has searched the web but still nothing to put on her paper! \n" ); document.write( "
Algebra.Com's Answer #52797 by ankor@dixie-net.com(22740)\"\" \"About 
You can put this solution on YOUR website!
The loudness of sound is based on intensity level measured in decibels using a logarithmic scale and is relative to (a ratio of) the weakest sound the ear can hear.
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\n" ); document.write( "With sound intensity we can use the decibel formula which compares a sound to
\n" ); document.write( "the threshold of hearing which is given as 10^-12. (Io in the formula)
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\n" ); document.write( "D = 10*log(I/Io)
\n" ); document.write( "where:
\n" ); document.write( "D = level of sound in decibels
\n" ); document.write( "I is the sound intensity measured in watts per square meter
\n" ); document.write( "Io is the threshold of hearing, which I is to be compared with (usually)
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\n" ); document.write( "Here are some intensity examples, I got out of an old algebra book:
\n" ); document.write( "1*(10^-12) Threshold of hearing
\n" ); document.write( "5.2(10^-10) Whisper
\n" ); document.write( "3.2(10^6) Normal conversation, (ahh, but what is normal??)
\n" ); document.write( "8.5(10^-4) Heavy traffic
\n" ); document.write( "3.2(10^-3) Jackhammer
\n" ); document.write( "1*(10^0) Threshold of pain
\n" ); document.write( "8.3(10^2) Jet plane with afterburner\r
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\n" ); document.write( "An example
\n" ); document.write( "Normal conversation is given as I = 3.2(10^-6): Find the Decibel level
\n" ); document.write( "D = 10*log\"%283.2%2A10%5E-6%29%2F%2810%5E-12%29\"
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\n" ); document.write( "D = 10*log(3.2*10^6): Remember 10^-6 divided by 10^-12 = 10^+6
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\n" ); document.write( "D = 10(6.50515); Enter: log(3.2*10^6) on a good calculator)
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\n" ); document.write( "D = 65 decibels is the level of normal conversation
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\n" ); document.write( "Try using this method to find the decibel of a whisper, you should get about
\n" ); document.write( "27 decibels
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\n" ); document.write( "The reason they use a logarithmic scale is because the ear has an incredible
\n" ); document.write( "hearing range. The loudest a healthy person can hear is about a trillion times
\n" ); document.write( "the softest sound it can hear. Logs makes comparing these levels manageable.
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