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Two identical EM wave sources emit waves with frequency of 3.49×105 Hz. The waves are propagating...

Two identical EM wave sources emit waves with frequency of 3.49×105 Hz. The waves are propagating in air. A detector captures minimum signal at 5153 m away from source 1. What is the distance from the detector to source 2?

5580 m
4720 m
All are possible
6440 m
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