What is the power output of the speakers

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Phyllis and Phred are attending a concert of the super popular rock band Mach 1 Mega Fizzix and they bring along a sound meter to measure sound intensity. With this device, Phyllis measures a sound level i1 = 0.0320 W/m^2 at her seat which is 7.85 m from the concert speakers. Phred sits a distance d = 2.75m closer to the stage than Phyllis.

a) What sound intensity level, in decibels, does Phred hear?

b) What is the power output of the speakers, assuming a uniform, spherical spread of sound?

Reference no: EM132536413

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