A man is wearing a hearing aid device that increases the frequency of the sounds the human ear can conceive, by 30 db. The device "catches" a sound of frequency f = 50 Hz, and intensity I = 3.00 * 10-11 W/m2. What's the intensity that the man's ear hears?
b = 10log(I/I0)
ΔPmax = sqrt(2pvI)
ω = 2πf
I = 0.5pv(ωSmax)2
p = 1.20 km/m3
v = 343 m/s
I0 = 10-12 W/m2
The Attempt at a Solution
Uh, I don't really have anything. From the problem's info I figured I'd put the original I into the formula for b, find it, then add 30 db to b, and then use the formula again to find the new I. But apparently that's not true. I'm not sure where the frequency is even used.
I know this is very bare-bones, but I coulf really use some help/guidance here.
Any kind of help is appreciated!