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Wavelength is commonly designated by the Greek letter lambda (Î»). The concept can also be applied to periodic waves of non-sinusoidal shape. The term wavelength is also sometimes applied to modulated waves, and to the sinusoidal envelopes of modulated waves or waves formed by interference of several sinusoids.here L is the slit width, R is the distance of the pattern (on the screen) from the slit, and Î» is the wavelength of light used. The function S has zeros where u is a non-zero integer, where are at x values at a separation proportion to wavelength.
1 Lambda indicates the wavelength of any wave, especially in physics, electronics engineering, and mathematics. 2  Lambda indicates the radioactivity decay constant in nuclear physics and radioactivity. 3  This constant is very simply related (by a multiplicative constant) to the half-life of any radioactive material. Lambda is the set of logical axioms in the axiomatic method of logical deduction in first-order logic. 2  Lambda was used as a shield pattern by the Spartan Army. 3  This stood for Lacedaemon, (Î»Î±ÎºÎµÎ´Î±Î¯Î¼ÏÎ½, LakedaimÅn), lakedaÃ­mÅn the name of the region Of.  sparta