Along the length of a classroom there sits two sound systems on opposite ends

Along the length of a classroom there sits two sound systems on opposite ends. Both sound systems are playing a constant tone with a frequency of 567 Hz. A student walks at a uniform rate of 1.50 m/s along the length of the room. She hears a single tone repeatedly becoming louder and softer. (a) Model these variations as beats between the Doppler-shifted sounds the student receives. Calculate the number of beats the student hears each second. (b) Model the two speakers as producing a standing wave in the room and the student as walking between antinodes. Calculate the number of intensity maxima the student hears each second.

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