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HELP :( A sound has an intensity level of 60 db at a distance 0.25 meters from its source.?

I dont think my teacher ever taught us how to do this.

if you figure it out could you please explain what you did?

a) what is the sound's intensity in W/m^2 at this location?

b) at what distance from the source will the sound's intensity be at the threshhold of hearing?

for b i got 249?? O.o

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