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electromagnetic spectrum


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The range of wavelengths over which electromagnetic radiation extends. The longest waves (105–10−3 metres) are radio waves, the next longest (10−3–10−6 m) are infrared waves, then comes the narrow band (4–7 × 10−7 m) of visible light, followed by ultraviolet radiation (10−7–10−9 m), X-rays (10−9–10−11 m), and gamma rays (10−11–10−14 m).


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