19.A window whose area is 2m2 opens on a street where the street noise results at the window an intensity level of 60dB.How much acoustic power enters the window through sound waves?----------

Intensity = 60 dB60 =10 logIIrefwhere Iref is the refrence intensity, general value of this is given by:Iref = 10-12 watt /m2I10-12 = antilog(6)I = 10-12 ×antilog(6) = 10-12×106 = 10-6Power = I×area = 2×10-6 watt

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