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大學普物問題!! Wave Optics!

A speaker

which emits a 200-Hz signal is 8 m from a microphone.They are equidisant from a wall. What is the minimum distance to the wall such that the sound that reaches the microphone directly

andthat which is reflected off the wall

interfere constructively. Take the speed of sound to be 340m/s. (There is no phase change on reflection.)
Since there

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