Asked by diddy
which light waves require a medium to travel
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GPT-5 mini
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None. Electromagnetic waves (including radio, microwave, infrared, visible light, ultraviolet, X-rays and gamma rays) do not require a material medium — they can propagate through vacuum. They are self‑sustaining oscillations of electric and magnetic fields (Maxwell’s theory), so unlike mechanical waves (sound, water, seismic) they don’t need a substance to travel through.
(History note: 19th‑century scientists hypothesized a “luminiferous ether” as a medium for light, but experiments such as Michelson–Morley and relativity showed no such medium exists. In practice, media do affect light’s speed, absorption and polarization, and waveguides or fibers confine light, but they aren’t required for propagation.)
(History note: 19th‑century scientists hypothesized a “luminiferous ether” as a medium for light, but experiments such as Michelson–Morley and relativity showed no such medium exists. In practice, media do affect light’s speed, absorption and polarization, and waveguides or fibers confine light, but they aren’t required for propagation.)
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