Erin is late tp physics class and is coming down the hall, Ask an Expert

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Erin is late tp physics class and is coming down the hall as the bells are ringing. There are two bells in the hall, one at the far end and one in front of the classroom she is approaching. Each rings with a frequency of 500 Hz. As erin comes down the hallway with a speed of 1m/s towards the classroom what frequency does she hear for each bell? and what beat frequency does she hear?

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