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Moe, Larry, and Curly stand in a line with a spacing of = 0.900 . Larry is 3.00 in front of a pair of stereo speakers 0.800 apart, as shown in the figure . The speakers produce a single-frequency tone, vibrating in phase with each other. What are the two lowest frequencies that allow Larry to hear a loud tone while Moe and Curly hear very little?

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