Chapter 28, Problem 5PCE

A person driving at 17 m/s crosses the line connecting two radio transmitters at right angles, as shown in Figure 28-41 The transmitters emit identical signals in phase with each other, which the driver receives on the car radio. When the car is at point A. the radio picks up a maximum net signal. (a) What is the longest possible wavelength of the radio waves? (b) At what time after the car passes point A does the radio experience a minimum in the net signal? Assume that the wavelength has the value found in part (a).