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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.
  When the frequency is decreased, the wavelength is increased.   Wavelength lambda and frequency f are connected by the wave speed c of the medium.   c can be air = â¦ 343 m/s at 20 degrees celsius or water at 0 dgrees = 1450 m/s.  c can be light waves or electromagnetic waves = 299 792 458 m/s.  For example, we will say â¦ that the standard wavelength is 5m.   F = 3.0 x 108 / 5   = 60,000,000 hertz    Say if we increased the wavelength to 6m:   F = 3.0 x 108 / 6   = 50,000,000 hertz     As you can see, if we increase the wavelength, the frequency decreases.