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The warning tag on a lawn mower states that it produces noise at a level of 91.0 dB. What is the intensity of this sound in watts per meter squared

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For  a lawnmower that produces noise at a level of 91.0 dB,  the intensity of this sound is mathematically given as

I=1.26*10^-3W/m^2

What is the intensity of this sound in watts per meter squared?

Generally, the equation for the sound   is mathematically given as

B=(10dB)log10(1/1_0)

Therefore

91/10=log(I/10^{-12})

I=1.26*10^-3W/m^2

In conclusion, the intensity

I=1.26*10^-3W/m^2

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