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The sound intensity level of 0 dB is defined as the threshold for hearing value of...

The sound intensity level of 0 dB is defined as the threshold for hearing value of I0 = 10-12 W/m2.
a) What is the sound intensity (in W.m-2) for a sound level of 46 dB?
b) The intensity of sound emitted from a point source decreases with the square of the distance according I2 = I1.(d1/d2)2. Given that the sound level intensity of 46 dB is obtained at a point d1 = 6.8 cm from a source, at what distance d2 from the source would the sound level be 34 dB?

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