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electromagnetic spectrumclick to hear

Electromagnetic waves that are classified in ascending order of energy (frequency); they propagate at the speed of light (300,000 km/s).
electromagnetic spectrum visible light gamma rays X-rays ultraviolet radiation infrared radiation microwaves radio waves

visible light click to hear

Electromagnetic radiation that is perceived by the human eye and ranges from red to violet.

gamma rays click to hear

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.

X-rays click to hear

Electromagnetic waves used especially in radiology; frequent exposure can be harmful.

ultraviolet radiation click to hear

Electromagnetic waves used especially to tan skin and in microscopy, medicine and lighting (fluorescent tubes).

infrared radiation click to hear

Electromagnetic waves emitted by warm objects; their many uses include heating, medicine, aerial photography and weaponry.

microwaves click to hear

Short electromagnetic waves; their many applications include radar detection and microwave ovens.

radio waves click to hear

Very long electromagnetic waves (about 1 meter) having low frequency; they are used to transmit information (television, radio).