To determine the wavelength of a waveform with a frequency of 123,456 cycles per second (CPS), we need to use the equation:
λ = v / f
However, we need to know the speed of the wave (v) in order to calculate the wavelength accurately. The speed of the wave depends on the medium through which it is propagating. If you provide the specific medium or the speed of the wave, I can help you calculate the wavelength.