A recording engineer works in a soundproofed room that is 47.5 dB quieter than the outside. If the sound intensity in the room is 1.40 x 10^-10 W/m2, what is the intensity outside?

I have done this numerous times and it is still wrong!

-47.5 = 10 log (1.4x 10^-10/1x 10^-10)

-47.5 = 10 log 1.4

Help please. I think I just confused myself!

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