__Problem 10:__
Two identical sound sources (e.g. speakers playing the same music) are separated by a distance of Δx = 3.54 m.
See the figure below.
Use 345 m/s for the speed of sound in air.

a) What is the lowest frequency for which there is destructive interference?

b) What is the lowest frequency for which there is constructive interference?

c) What is the next-higher frequency for which there is destructive interference?

...This pattern of alternating constructive and destructive interference is known as *Comb Filtering*.

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