Transcript: Wavelength and frequency have an inverse relation for electromagnetic waves. Remember that wavelength is the distance between two peaks or troughs in the radiation and frequency is the number of peaks or troughs that pass every second. Inverse relation is clearer in terms of an analogy. Imagine a set of railroad cars passing by you at a fixed speed. If this length of the railroad cars is cut in half then twice as many cars will pass by per second. The frequency has doubled, but the wavelength of the cars has halved. This is the same with the electromagnetic spectrum. Going from radio waves towards gamma rays corresponds to decreasing wavelength and increasing frequency. The product of the two is always the fundamental constant “c”, 300 thousand kilometers per second, the speed of light and all other forms of electromagnetic radiation.