Two radio antennas radi ating in phase are located at points A and B, 200 m apart (Fig. 35.23). 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 Be shown in Fig. 35.23). 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 notapply.)

A 200 m B C