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They're at the low end of the electromagnetic spectrum
Answer for the clue "They're at the low end of the electromagnetic spectrum ", 10 letters:
radiowaves
Alternative clues for the word radiowaves
Word definitions for radiowaves in dictionaries
Wiktionary
Word definitions in Wiktionary
n. (alternative spelling of radio waves English)
Usage examples of radiowaves.
And we have forgotten the ultraviolet light, the X-rays, and the radiowaves travelling through the room.
Such radiowaves have been detected from places in space beyond the range of the greatest optical telescopes.