## Essential University Physics: Volume 1 (3rd Edition)

We first use the Pythagorean theorem: $AP = \sqrt{75^2 + 43 ^2 } = \approx 86.5\ m$ $BP = \sqrt{75^2 + 23 ^2 } = \approx 78.4\ m$ Thus, using these values, we can find the wavelength: $\lambda = 2( AP-BP) = 2(86.5-78.4) \approx 16 \ m$