The electromagnetic spectrum represents the complete range of electromagnetic radiation. For example, radio waves have the longest wavelength and the lowest frequency. The shorter the wavelength is, the higher its frequency will be. Frequency is expressed in hertz (Hz) and refers to the number of wavelengths that pass a fixed point in 1 second. The highest point of a wave is called the crest, and the lowest point of a wave is called the trough.
The wavelength is the distance between two wave crests or troughs.
These waves have both electrical and magnetic properties and can travel through gases, liquids, solids, and through empty space (or a vacuum) at nearly 300,000 kilometers per second (the speed of light).Įlectromagnetic waves are characterized by wavelength and frequency.
Electromagnetic waves are waves that can cause charged particles (such as electrons) to move up and down.
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