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**1. Homework Statement**

Two loudspeakers are 2.5 m apart. A person stands 2.9 m from one speaker and 4.0 m from the other. Assume the air temperature is 20°C.

a) What is the lowest frequency at which destructive interference will occur at this point?

(b) Calculate the next two frequencies that also result in destructive interference at this point.

**2. Homework Equations**

not sure if these apply:

v=f*lambda

L=n(lambda/2)

L=n(lambda/4)

**3. The Attempt at a Solution**

i have no idea how to get a start on this problem