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A physics professor demonstrates the Doppler effect by tying a 550 Hz sound generator to a 1.0-m-long rope and whirling it around her head in a horizontal circle at 120 rpm. Assume the room temperature is 20°C. A) What is the highest frequency heard by a student in the classroom? (in Hz) B) What is the lowest frequency heard by a student in the classroom? (in Hz)

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