Electromagnetic waves are waves that can propagate even though there is no medium. Propagate in a wave of electromagnetic energy with a few characters that can be measured, namely: wavelength / wavelength, frequency, amplitude / amplitude, velocity. Amplitude is the height of the wave, while the wavelength is the distance between two peaks. Frequency is the number of waves passing through a node in one time unit. Frequency depends on the speed of the wave merambatnya. Since the speed of electromagnetic energy is constant (speed of light), wavelength and frequency is inversely proportional. The longer a wave, the lower the frequency, and the shorter the higher the frequency of a wave.
