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ELECTROMAGNETIC RADIATION

ELECTROMAGNETIC RADIATION. Electromagnetic radiation. Electromagnetic Radiation. Most subatomic particles behave as PARTICLES and obey the physics of waves. wavelength. Visible light. Amplitude. wavelength. Node. Ultaviolet radiation. Electromagnetic Radiation. Electromagnetic Radiation.

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ELECTROMAGNETIC RADIATION

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  1. ELECTROMAGNETIC RADIATION

  2. Electromagnetic radiation.

  3. Electromagnetic Radiation • Most subatomic particles behave as PARTICLES and obey the physics of waves.

  4. wavelength Visible light Amplitude wavelength Node Ultaviolet radiation Electromagnetic Radiation

  5. Electromagnetic Radiation • Waves have a frequency • Use the Greek letter “nu”, , for frequency, and units are “cycles per sec” • All radiation:  •  = cwhere c = velocity of light = 3.00 x 108 m/sec

  6. increasing frequency increasing wavelength Electromagnetic Spectrum Long wavelength --> small frequency Short wavelength --> high frequency

  7. ElectromagneticSpectrum In increasing energy, ROYGBIV

  8. Excited Gases & Atomic Structure

  9. Atomic Line Emission Spectra and Niels Bohr Bohr’s greatest contribution to science was in building a simple model of the atom. It was based on an understanding of theLINE EMISSION SPECTRAof excited atoms. • Problem is that the model only works for H Niels Bohr (1885-1962)

  10. Spectrum of White Light

  11. Line Emission Spectra of Excited Atoms • Excited atoms emit light of only certain wavelengths • The wavelengths of emitted light depend on the element.

  12. Spectrum of Excited Hydrogen Gas

  13. Line Spectra of Other Elements

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