A loud car stereo has a decibel level of 110 dB. How many times as intense as the sound of a loud card stereo is the sound of a rock concert speaker. A rock concert speaker has a decibel level of 150 dB.
This is my work:
B_2 - B_1 = 10log(I_2/I_1)
Therefore the sound of a loud rock stereo is 0.0001 times as intense as a sound of a rock concert speaker.
HOWEVER, the real question comes here: my answer is 0.0001 times, but the answer in the back says 10000 times. so 10^4 instead of my 10^-4.
I think that the back of the book is wrong though BECAUSE, if a rock concert speaker is more loud than a car stereo, then how can a car stereo be more intense than a rock concert speaker? Am I wrong or right? Explain why please.