Hi
Let I1 be the intensity for D1 = 47 dB
Let I2 be the intensity for D2 = 42 dB
I got through 3 problems involving decibels, and now it asks me this: "How many times more intensity does a sound of 47dB have than a sound of 42dB?"
The decibel equation is: D = 10 log(I/10^-16) where I is intensity( ) and D is decibels. And I might mention, intensity is in 10^-n and n is a number lower than 16