Consider again the interfering radio waves in Problem , but now assume the amplitude of the reflected wave is exactly half the amplitude of the wave that arrives directly. If the amplitude of the direct wave is A, what is the intensity at the receiver when there is (a) constructive interference or (b) destructive interference?
Problem:
Waves from a radio station have a wavelength of 250 m. These waves can travel directly from the antenna to a receiver or can reflect from a nearby mountain cliff and then reach the receiver (Fig. P25.7). If the distance from the receiver to the cliff is L =1000 m, is there constructive or destructive interference at the receiver? Assume there is no phase change when the radio wave reflects from the cliff.
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