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Your clock radio awakens you with a steady and irritating sound of frequency 600 Hz. One morning, it malfunctions and cannot be turned off. In frustration, you drop the clock radio out of your fourth-story dorm window, 15.0 m from the ground. Assume the speed of sound is 343 m/s. The sound waves of the radio alarm also reflect off the sidewalk and return to you. What is the frequency of this reflected sound just before the radio strikes the ground?

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