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**1. Homework Statement**

*A microphone is located on the line connecting two speakers that are 0.517 m apart and oscillating 180° out of phase. The microphone is 1.96 m from the midpoint of the two speakers. What is the lowest frequency that produces an interference maximum at the microphone's location?*

What is the next lowest frequency that produces an interference maximum at the microphone's location?

What is the next lowest frequency that produces an interference maximum at the microphone's location?

**2. Homework Equations**

r2 -r1 = (n-0.5)(lambda)

lambda=v/f

v=343m/s

**3. The Attempt at a Solution**

r2 and r1 are the distances from the speaker

so r2 is .517/2 + 1.96 = 2.2185

and r1 is .517/2 + 2.2185 = 2.477

i know i have to solve for frequency so i plugged (343m/s)/f into the equation

but then i got stuck. what do i plug in for n and how i change n for the lowest frequency and the next lowest?