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Radio tower A is 2.1 km north of radio tower B. Starting at tower A, Kristyn...

Radio tower A is 2.1 km north of radio tower B. Starting at tower A, Kristyn walks along the straight-line path to tower B. If the towers emit radio waves of frequency 540 kHz and the two sources are coherent and in phase, what is the minimum distance Kristyn must walk to be at a location of destructive interference?

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