Two coherent sources of radio waves emit identical signals of wavelength λ = 2 m in phase with each other as shown. The two sources are 6 m apart. What is the minimum distance between the receiver and source B, r_B, such that the receiver does not detect any signal? Receiver TA A. 17.5 m B. 18.5 m C. 7.5 m D. 4.5 m TB d = 6m Source A Source B

Two coherent sources of radio waves emit identical signals of wavelength λ = 2 m in phase with each other as shown. The two sources are 6 m apart. What is the minimum distance between the receiver and source B, r_B, such that the receiver does not detect any signal? Receiver TA A. 17.5 m B. 18.5 m C. 7.5 m D. 4.5 m TB d = 6m Source A Source B