# Constructive and destructive interefernec and a pair of speakers

 P: 1,031 Constructive and destructive interefernec and a pair of speakers Constructive Interference occurs at $$n\lambda$$ Destructive Interference occurs at $$\frac{n}{2 \lambda}$$ Using the basic wave equation, speed = wavelength * frequency, they can be rearranged for frequency: Constructive Interference occurs at $$n(\frac{344}{f})$$ Destructive Interference occurs at $$n(\frac{344}{2f})$$ but I am unsure how I should proceed from now? (I hope this is relevant) Any help would be much appreciated, TFM
 P: 1,031 Looked in my book, fpuind the right equation: constructive: $$f_n = \frac{nv}{d}$$ destructive: $$f_n = \frac{nv}{2d}$$ where d is the path difference. TFM