![]() When this cancellation occurs, it is called destructive interference. Instead of a crest or a trough, there is nothing. When the two waves have the same amplitude, this interaction causes them to cancel each other out. In other parts of the wave pattern, crests from one wave will overlap troughs from another wave. Once the waves pass through each other and are alone again, their amplitudes return to their original values. Within the interference pattern, the amplitude will be twice the original amplitude. This is called constructive interference because the resultant wave is larger than the original waves. Nearby, a wave trough will overlap another wave trough and the new trough will be twice as deep as the original. Since both waves are lifting the medium, the combined wave crest will be twice as high as the original crests. ![]() ![]() In some places, a wave crest from one source will overlap a wave crest from the other source. At the location where the two waves collide, the result is essentially a summation of the two waves. Figure 13.8.2Īny two waves in the same medium undergo wave interference as they pass each other. While the waves become circular waves at the point source, they continue as straight waves where the barrier does not interfere with the waves. This phenomenon is called diffraction, and it occurs in liquid, sound, and light waves. However, the last particle of the medium at the back corner of the barrier will create circular waves from that point, called the point source. When a series of straight waves strike an impenetrable barrier, the waves stop at the barrier.
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