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physics ..PLEASE HELP ASSIGN DUE SOON :(

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A microphone has an area of 3.0cm^2. It receives during a 6.00s time period a sound energy of 1.0x10-11J. What is the intensity of the sound?

b). Using the intensity in the previous question, what is the variation of pressure in the sound wave if the speed of sound is 343m/s and the density of air is 1.2kg/m^3?

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