Chapter 34, Problem 47GP

Television and radio waves reflecting from mountains or airplanes can interfere with the direct signal from the Station. (a) What kind of interference will occur when 75-MHz television signals arrive at a receiver directly from a distant station, and are reflected from a nearby airplane 122 m directly above the receiver? Assume $\frac{1}{2}\lambda$ change in phase of the signal upon reflection. (b) What kind of interference will occur if the plane is 22 m closer to the receiver?