Homework Help: Physics

Posted by Student in Need on Thursday, March 3, 2011 at 10:27pm.

Your stereo is set to a sound intensity level (SIL) of 60 dB. I'd like to know what this means in terms of energy flow: what is the intensity of the sound wave this produces? Compute your answer in W/m2, but do not enter units.

So in my problem it would be 1,000,000 OR 10 to the negative 6 or 10E-6..the computer is saying all of these are incorrect

Physics - bobpursley, Thursday, March 3, 2011 at 10:38pm
SIL= 10 log (Intensity/reference intensity)

in general, reference power level is 1*10^-12 watts/m^2

taking the antilog of each side:

1E6=I/1E-12
I= 1E-6 watts/m^2

I dont know your computer, but in standard notation it would be
0.000001 or
1*10^-6 or
1E-6 or in some cases 1EE-6

So all of your answers are wrong.
1,000,000 is way off
10^-6 is almost right (1*10^-6 is prefered)
10E-6 is off by a factor of 10.

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