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sghaussi

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**Two radio antennas A and B radiate in phase. Antenna B is a distance of X meters to the right of antenna A. Consider point Q along the extension of the line connecting the antennas, a horizontal distance of Y meters to the right of antenna B. The frequency, and hence the wavelength, of the emitted waves can be varied.**

What is the longest wavelength for which there will be destructive interference at point Q?

What is the longest wavelength for which there will be destructive interference at point Q?

I know I want to use the formula: (r2 - r1) = (m + 1/2)lamda

my r2 is the distance from B to Q which is Y meters

my r1 is the distance from A to Q which is Y + X meters

I'm trying to solve for lamda, but I don't know what m is. I know m has to do with "the longest wavelength" but I'm not sure how to calculate it. Or is it 0? I was guessing it would be 0 or 1. The book isn't clear. I hope you can help me!