Electromagnetic Waves Spectrum

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  1. The full range of electromagnetic waves, arrange orderly in their wavelengths and frequencies is called the electromagnetic spectrum.
  2. The figure above shows the electromagnetic waves in the electromagnetic spectrum.
  3. In SPM, you need to know
    1. The order of the electromagnetic waves in the electromagnetic spectrum.
    2. The sources of the electromagnetic waves
    3. The applications of the electromagnetic waves

Sources of Electromagnetic Waves

Electromagnetic WavesSource
Radio WaveElectrical oscillating circuit (consists of a capacitor and a conductor connected in series)
MicrowaveThe oscillating electrical charge in a microwave transmitter
InfraredHot bodies, the sun and fires
Visible LightThe sun, hot objects, fires, light bulbs, fluorescent tubes
UltravioletVery hot objects, the sun, mercury vapour lamps
X-rayX-ray tubes where high energy electrons bombarding a metal plate.
Gamma RayRadioactive substances