RegisterStanding waveIf at least two coherent waves propagate in different directions, then they mutually interfere. In some regions, their phase is permanently identical, intensities are summed and the total intensity is high. In other regions, their phase is not identical, and the sum of intensities is lower. The total field intensity differs from region to region. The variation is not monotonous, and even the phase does not change equably. In the space, the standing wave appeared. Regions of the lowest amplitude of field intensity are called nodes, and regions of the highest intensity are called loops. Standing waves can be observed in media where wave reflection appears (inhomogeneous medium). The forward wave interferes with the backward one. Their propagation directions differ in 180 degrees. Back
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