own below: 1,000,000 Hertz = 1000 kilohertz = 1 megahertz On the wonderful road to optical networking we began to use light, which requires even larger units for expression. This resulted in the use of the term gigahertz (GHz) for representing 1000 MHz. Thus another relation that warrants notice is: Copyright 2001 The McGraw-Hill Companies, Inc. Click Here for Terms of Use. Appendix A 1 GHz = 1000 MHz =1,000,000kHz The term wavelength dates from the early days of radio. Back then when life was simple we would gather around the radio in the evening to listen to mystery shows, the top ten songs, and on occasion fireside chats. Back then frequencies were measured in terms of the distance between the peaks of two consecutive cycles of a radio wave instead of the number of cycles per second or the modern-day Hz. What was actually being measured was the wavelength of radio waves, which represents the distance between two troughs or two crests of the radio wave. During the past century physicists determined the relationship between wavelength and frequency. In doing SO they discovered that both the frequency and wavelength were also related to the velocity of propaga- tion of a wave. Physicists determined that the length of a wave multiplied by its frequency gives the velocity at which the wave travels. The equation that relates wavelength, frequency, and velocity is shown below: w X f= v where W is the wavelength, f is the frequency, and V is the velocity of the wave. For electromagnetic radiation, the velocity of the wave is equal to the speed of light cand the equation becomes: w X f= c Even though radio waves are like other types of radiation in that they are invisible, there is a measurable distance between the cycles of electro- magnetic fields making up such waves. The distance between the peaks of two consecutive cycles of a radio wave is measured in meters. The relationship between a radio signal's frequency in Hz and its wavelength in meters can be found by the following formula: wavelength=3x108/f(Hz) = In th