P1a Topic 2 Revision 0.0 / 5 ? PhysicsElectromagnetic SpectrumGCSEEdexcel Created by: leilanahCreated on: 17-02-15 17:09 Electromagnetic Waves Seven groups: Radio waves, Microwaves, Infrared, Visible Light, Ultraviolet, X-Rays, Gamma All EM waves are transverse and travel at the same speed in a vacuum e.g. space Longer wavelengths = Lower frequency, Shorter wavelengths = Higher frequency Infrared Radiation: Herschel 1800 Placed a prism infront of white light, creating a spectrum of 7 colours Used 3 thermometers to record each temperature - increased from violent tor red Measure temperature just past red where no visible light - highest temperatre; invisible infrared Ultraviolet Radiation: Ritter soon after 1801 Ritter carried out experiments to see if there was light beyond the spectrum of violet Measured how quickly silver chloride coated *****s changed when exposed to different colours Dark room, created a spectrum using a light source and prism, exposing the *****s to each colour After timing, *****s changed quickest (white->black) when exposed to light nearer blue end Placed a ***** in area past the violet part of the spectrum, changed quickest; invisible ultraviolet 1 of 1
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