Two radio-frequency point sources separated by 3.0 m are radiating in phase with = 0. A detector moves in a circular path around the two sources in a...

Two radio-frequency point sources separated by 3.0 m are radiating in phase with λ = 0.50 m. A detector moves in a circular path around the two sources in a plane containing them. Without written calculation, find how many maxima it detects.