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1.) What is the intensity, I, of a sound with a decibel rating of 75?

 Apr 16, 2019
 #1
avatar+103121 
+2

Not totally sure about this , GM....check the answer

 

75  =  10 [ log I / I0  ]      divide both sides by 10

 

75/10   [ log I / 10^(-12) ]   

 

7.5  = [ log I ] /[ 10^(-12)]      and we can write

 

7.5 = log I -  log10^(-12)          [ -log 10^(-12)  = -( -12) log 10  =  12 * 1   = 12 ] 

 

7.5 =   log I  - (-12)

 

7.5 = log I + 12

 

7.5 - 12 = log I

 

-5.5 = log I          using the exponential form

 

10^(-5.5) w/m^2   =  I

 

 

cool cool cool

 Apr 16, 2019
 #2
avatar+8 
+1

Thanks, CPhill, I'm not totally sure about it either but its the best I have for now. Can you at least solve c.) and d.) here? https://web2.0calc.com/questions/on-the-axes-below-graph-y-3-x-confused

GAMEMASTERX40  Apr 16, 2019

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