Answer
16 meters
Work Step by Step
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:
$\lambda = 2( AP-BP) = 2(86.5-78.4) \approx 16 \ m$
