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Electromagnetic Spectrum PowerPoint Presentation
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Electromagnetic Spectrum

Electromagnetic Spectrum

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Electromagnetic Spectrum

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  1. Electromagnetic Spectrum • MW ovens (2.45 GHz): • = 12.2 cm • Remote controls • = 980 nm • KBCO (97.3 MHz): • = 3.08 m • KVOD (88.1 MHz): • l = 3.33 m

  2. Solar Spectrum wavelength in Å Joseph von Fraunhofer, 1814

  3. Radiation from hot objects

  4. Emission Spectra Emission spectrum of Hydrogen

  5. Emission Spectra Emission spectrum of Hydrogen Emission spectrum of Iron

  6. Kirchhoff’s Three Laws of Spectroscopy: • Light from a hot solid object has a continuous spectrum with no dark lines • The same light, passed through a cool gas has the same spectrum, but with certain wavelengths missing  dark lines (absorption spectrum) • Light emitted by a hot gas  bright lines superimposed on an otherwise black background  emission spectrum UV IR