Find the noise level of a sound having an intensity of 1.5x10^-14w/m^2 given i0=10^12 w/m2

20.5 db

-18.2 db

-17.6 db

15.4 db

Noise level will be -18.2 watt

So option (b) will be correct answer

Explanation:

We have given sound intensity

And threshold intensity ( in question it is given as but its standard value is )

Now noise level  

So the noise level will be -18.2

So option (b) will be correct answer

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