Question

1 Review The sound intensity 53.0 m from a wailing tornado siren is 0.200 W/m² Part A What is the intensity at 1200 m ? Express your answer with the appropriate units. HÅR O O ? Value Units Submit Request Answer Part B luw/mº. Estimate the maximum The weakest intensity likely to be heard over background noise is distance at which the siren can be heard. Express your answer with the appropriate units. CHÅR O ? Value Units Submit Request Answer

Answer 1

use the relation between power and intensity to find the required distance at which the siren can be heard as shown below

I= P 45R2 1 =) 0.2 W/m2 = P 41(53m) 2 » P = 7059.8W so, I'= Patriz , put R2 = 1200m => I' - 3.9x 10-4|wme 411212 Is I = - P 478² =) 10-6 W/m2= 7059.8W 4282 =) R = [2.37x104m

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