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The Electromagnetic Spectrum

The Electromagnetic Spectrum. Characteristics of waves. Peak Trough Amplitude Wavelength (  ) (in meters) Frequency measured in Hertz: (Hz): cycles per second. Mathematical Relationship. Speed of a wave = wavelength * frequency v= f Increased frequency has increased energy

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The Electromagnetic Spectrum

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  1. The Electromagnetic Spectrum

  2. Characteristics of waves • Peak • Trough • Amplitude • Wavelength () (in meters) • Frequency measured in Hertz: (Hz): cycles per second

  3. Mathematical Relationship • Speed of a wave = wavelength * frequency • v=f • Increased frequency has increased energy • for Electromagnetic waves: • Speed = 3.0x108 m/s (speed of light) • c = 3.0x108 m/s

  4. Types of Electromagnetic radiation Large  Small f Low NRG Radio Waves Microwaves Infrared Visual Light Ultra Violet X-Ray Gamma Ray Rabid Monkeys In Violet Underpants eXterminate Gibbons Small  Large f High NRG

  5. The Visible Light Spectrum • Range of wavelengths in the visible spectrum 7.5 x 10-7 m 4 x 10-7 m 750nm 400nm R O Y G B I V

  6. White LIght • All colours added together

  7. Line Spectrum • Continuous Colour Spectrum A line spectrum consists of distinct bright lines appearing on a dark background that occur in different parts of the visible spectrum.

  8. Atoms Emitting Light • An atom excited by addition of energy (heat) will send off electron(s) from its orbital. As the electron returns, it emits electromagnetic waves, and can be seen as coloured light. • P.143

  9. Unique Fingerprint

  10. http://www.lon-capa.org/~mmp/kap29/Bohr/app.htm • http://physics.gac.edu/~chuck/PRENHALL/Chapter%2031/AABXTEI0.html • http://mo-www.harvard.edu/Java/MiniSpectroscopy.html • http://jersey.uoregon.edu/vlab/elements/Elements.html • http://www.colorado.edu/physics/2000/quantumzone/index.html

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