Question

1. The diagram below shows the wave crests for two sources that are totally out of phase. For each of the labeled points, determine whether the light intensity (not the wave amplitude) is a minimum or a maximum.

2a. (c24p63) Figure P24.63 shows a radio wave transmitter and a receiver, both h = 125 m above the ground and d = 400.00 m apart. The receiver can receive signals both directly, from the transmitter, and indirectly, from signals that bounce off the ground. If the ground is level between the transmitter and receiver and a λ/2 phase shift occurs upon reflection, determine the longest wavelengths that interfere (a) constructively.

2b. Determine the longest wavelengths that interfere (b) destructively.