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| Monikko | T-rays |
(electrical engineering, electromagnetism, also, attributive, chiefly in the plural) An electromagnetic wave with a frequency intermediate between, and sharing the properties of, short radio waves and long infrared waves, generally in the 0.1 to 10 terahertz (THz) band of frequencies.
An illustration showing the location of T-rays in the electromagnetic spectrum. They lie mostly at the far end of the infrared band, the longest ones being in the microwave band.