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

GAMEMASTERX40 Apr 16, 2019

#1**+2 **

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

75 = 10 [ log I / I_{0 ]} 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

CPhill Apr 16, 2019

#2**+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