A phase constant represents the change in phase per unit length for a standing plane wave. The phase constant of a standing plane wave is denoted with the greek letter β (beta) and demonstrated the relationship between waveform cycles and wavelength. This quantity is often treated equally with a plane wave's wave number. However, this must be used with caution because the medium of travel changes this equality. Calculating the phase constant from frequency is a relatively simple mathematical operation.
Create an empty fraction.
Place 2π in the numerator.
Place the wavelength, often denoted as the Greek letter λ (Lambda), in the denominator.
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Perform the indicated division and simplify as necessary. This final value is the phase constant of the plane wave being investigated.