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physics - sound level

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The source of a sound wave has a power of 2.50 µW. Assume it is a point source.
(a) What is the intensity 6.70 m away?
I used I = Power / 4*pi*r^2 and found I to be 4.43x10^-9 W/m^2
(b) What is the sound level at that distance?
Sound level = 10 dB*log [(Intensity)/(Intensity Initial)]
How do I find Intensity Initial in order to calculate the sound level?


Never mind, I got it. Thanks!

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