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 ½ λ 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?