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I want help for the given question:

Question: The speed of sound ion air is 320 m/s. If two speakers are set up 1.2 meters apart and both generate a 694 Hz tone,

A- Find the angle in degrees away from the center line between the two speakers where the there is a first order minimum in the sound from the speakers.

Show how you get the answer, so that I can better understand how to do it. Thanks.

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