Physics: Waves and Pressure A stereo speaker represented by P in the figure emit

Question

Physics: Waves and Pressure

A stereo speaker represented by P in the figure emits sound waves with a power output of 105.0 W. What is the intensity of the sound waves at point x, 19.9 m away? Answer in units of W/m 2 A police car is traveling at a speed v c to the left and a truck is traveling at a speed v t to the right. The frequency of the siren on the police car is f c. What is the frequency f t heard by an observer in the moving truck? Let v t be the speed of the observer in the truck, and v c be the speed of the source, the police car. The speed of sound in air is v a.

Explanation / Answer

1)P=I/4pier^2 =105/(4pie*19.9^2 ) =2.11x10^-2 W/m^2

2)4th option

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