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About the Visual
Electromagnetic waves that are classified in ascending order of energy (frequency); they propagate at the speed of light (300,000 km/s).
See electromagnetic spectrum in :
Electromagnetic radiation that is perceived by the human eye and ranges from red to violet.
Electromagnetic waves of very high frequency that are emitted by radioactive bodies; they are the most radiant and harmful rays and are used especially in treating cancer.
Electromagnetic waves used especially in radiology; frequent exposure can be harmful.
Electromagnetic waves used especially to tan skin and in microscopy, medicine and lighting (fluorescent tubes).
Electromagnetic waves emitted by warm objects; their many uses include heating, medicine, aerial photography and weaponry.
Very short electromagnetic waves; their many applications include radar detection and microwave ovens.
Very long electromagnetic waves (about 1 meter) having low frequency; they are used to transmit information (television, radio).
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