Two loudspeakers are 1.80m apart. A person stands 3.00 m from one speaker and 3.50m from the

Question:

Two loudspeakers are 1.80m apart. A person stands 3.00 m from one speaker and 3.50m from the other.
(a) What is the lowest frequency at which destructive interference will occur at this point?
(b) Calculate two other frequencies that also result in destructive interference at this point (give the next two highest). Let T = 20oC.