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UPS17 MP3 Google Chrome Secure l https://session.masteringphysics.com/myct/temView 1242 signed in as brianna thomas Help University Physics at FDU UPS17 MP3 Problem 20.31 previous l 4 of 7 next Problem 20.31 Part A What is the sound intensity level at a distance of 1.0 km? During takeoff, the sound intensity level of a jet ALI engine is 170 dB at a distance of 40 m Express your answer to two significant figures and include the appropriate units RE FARM EY FOR A SANDWICH NSPIRED Value Units Submit My Answers Give Up Provide Eeedback Continue A concert loudspeaker suspended high ott thearoundemits 31.ow ot sound

Explanation / Answer

The intensity of the sound is calculated as follows

Beta = 10log(I/I0)

I = I0*10^(beta/10)

= (10^-12)*10^(170/10)

= 1.0*10^5 W/m^2

The new intensity of the sound is calculated as follows

I' = (r1/r2)^2*I

= (40 m/1000 m) ^2*(1.0*10*5 W/m^2)

= 160 W/m^2

Therefore the intensity level of the sound wave is

beta = 10log(I/I0)

= 10log(160 W/m^2/10^-12 W/m^2)

= 142 db

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