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| (This file is shared by Philip Ronan under the Creative Commons Attribution-Share Alike 3.0 Unported license.) |
- The full range of electromagnetic waves, arrange orderly in their wavelengths and frequencies is called the electromagnetic spectrum.
- Figure above shows the electromagnetic waves in electromagnetic spectrum.
- In SPM, you need to know
- The order of the electromagnetic waves in electromagnetic spectrum.
- The sources of the electromagnetic waves
- The applications of the electromagnetic waves
Sources of Electromagnetic Waves
| Electromagnetic Waves | Source |
| Radio Wave | Electrical oscillating circuit (consists of a capacitor and an conductor connected in series) |
| Microwave | Oscillating electrical charge in a microwave transmitter |
| Infrared | Hot bodies, the sun and fires |
| Visible Light | The sun, hot objects, fires, light bulbs, fluorescent tubes |
| Ultraviolet | Very hot objects, the sun, mercury vapour lamps |
| X-ray | X-ray tubes where high energy electrons bombarding a metal plate. |
| Gamma Ray | Radioactive substances |
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