Chapter 35, Problem 35.43P

Two radio antennas radiating in phase are located at points A and B, 200 m apart (Fig. P35.43). The radio waves have a frequency of 5.80 MHz. A radio receiver is moved out from point B along a line perpendicular to the line connecting A and B (line BC shown in Fig. P35.43). At what distances from B will there be destructive interference? (Note: The distance of the receiver from the sources is not large in comparison to the separation of the sources, so Eq. (35.5) does not apply.)

Figure P35.43