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Waves of the same frequency propagate in opposite directions at a speed of 680 m / s through a medium. The distance between the nodes

Waves of the same frequency propagate in opposite directions at a speed of 680 m / s through a medium. The distance between the nodes of the resulting interference pattern is 15 cm. What is the frequency of the wave generator? Select the correct answer from the following list:

 

.907e4 Hz 45.3 Hz .453e4 Hz .227e4 Hz

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