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Suppose that a public-address system emits a 494 Hz sound uniformly
in all directions. (a) If the air temperature is 250C (sound travels at 346
m/s), what is the wavelength of this sound? (b) If the intensity at a
location 22 m away from the sound source is 3x10-4 W/m2, what is
the power of the sound coming from the speaker?

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