일반물리학 2 — Interference: Problem 81

81 In Fig. 35-39, two radio-frequency point sources \(S_1\) and \(S_2\), separated by distance \(d = 1.8 \text{ m}\), are radiating in phase with \(\lambda = 0.50 \text{ m}\). A detector moves in a large circular path around the two sources in a plane containing them. How many (a) maxima and (b) minima does it detect?