Question: Sound source A is located at x = 0 , y = 0 , and sound source B is located at x = 0 ,

Sound source A is located at x=0,y=0, and sound source B is located at x=0,y=1.70m. The two sources radiate coherently and in phase. An observer at x=19.0m,y=0 notes that as he takes a few steps from y=0 in either the +y or -y direction, the sound intensity diminishes.
What is the lowest frequency f1 of the sources that can account for that observation?
f1=
What is the second-lowest frequency f2 of the sources that can account for that observation?
f2=

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