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The plane wavefront is a good model for a surface-section of a very large spherical wavefront; for instance, sunlight strikes the earth with a spherical wavefront that has a radius of about 150 million kilometers (1 AU). For many purposes, such a wavefront can be considered planar over distances of the diameter of Earth.
John Whitby Allen. John Whitby Allen (July 2, 1913 – January 6, 1973) was an American model railroader who created the HO scale Gorre & Daphetid model railroad in Monterey, California, and wrote numerous magazine articles on model railroading starting in the 1940s. Allen was renowned for his skill at scratch building and creating scenery.
Model railroad layout design and operations. John H. Armstrong (November 18, 1920 – July 28, 2004) was a mechanical engineer, inventor, editor, prolific author, and model railroader best known for layout design and operations. He was married for 44 years to Ellen Palmer. They had four children.
The term is also used, even more specifically, to mean a "monochromatic" or sinusoidal plane wave: a travelling plane wave whose profile () is a sinusoidal function. That is, (,) = (() +) The parameter , which may be a scalar or a vector, is called the amplitude of the wave; the scalar coefficient is its "spatial frequency"; and the scalar is its "phase shift".
In physics, interference is a phenomenon in which two coherent waves are combined by adding their intensities or displacements with due consideration for their phase difference. The resultant wave may have greater intensity (constructive interference) or lower amplitude (destructive interference) if the two waves are in phase or out of phase ...
Traveling plane wave. The wavefronts of a traveling plane wave in three-dimensional space. In mathematics and physics, a traveling plane wave[1] is a special case of plane wave, namely a field whose evolution in time can be described as simple translation of its values at a constant wave speed , along a fixed direction of propagation .