7457 MasteringPhysics UPS17-MP3-Google Chrome Secure I https://sessionmasteringp

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7457 MasteringPhysics UPS17-MP3-Google Chrome Secure I https://sessionmasteringphysics.com/myct/itemview?assignmentProblemIDa77124252&offset; next University Physics at FDU signed in as brianna thomas UPS17-MP3 Problem 20.30 previous 3 of T l next Problem 20.30 Part A What is the sound intensity at the position of the microphone? AL A concert loudspeaker s high off the ground emits 35.0 W of sound power A small Express your answer with the appropriate units. Bo microphone with a 0.700 cm area is 50.0 m from the speaker. Tallie Units Submit My Answers Give up Part B How much sound energy mpinges on the microphone each second Express your answer with the appropriate units. o: A concert loudspeaker suspended high off the around 310 wot sound emits

Explanation / Answer

Given

power of sound   P = 35 W

distance between micro phone and speaker 50 m

a) intensity of sound at micro phone is

                 I = P / A

                    = 35 W / 4 ( 50m ) 2  

                    = 1.114*10^-3 W / m 2  

                     = 1.114 mW / m 2     

b) sound intensity level at the position of micro phone is

                 = 10 log ( I / I o )

         here   I o = 1 * 10 -12 W / m 2  

                = 10 log ( 0.00114 / 10-12 )

                      = 90.47 dB

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