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Exciting Electrons

Exciting Electrons. Can electrons move between energy levels? How do we know?. Parts of a Wave: energy traveling through space!. Horizontal distance from crest to crest . Vertical distance from zero (node) to crest of wave. What about Frequency?.

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Exciting Electrons

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  1. Exciting Electrons Can electrons move between energy levels? How do we know?

  2. Parts of a Wave:energy traveling through space! Horizontal distance from crest to crest Vertical distance from zero (node) to crest of wave

  3. What about Frequency? • Frequency (ν) = cycles past a given point in a fixed amount of time, cycles per second, Hz or s-1 • Wavelength and frequency are inversely related.

  4. How are wavelength and frequency related? Inversely related!

  5. How do we know this?Math Relationship Speed of Light Constant (c) = 2.998 x 108 m/sec c = λν 2.998 x 108m/sec= λν

  6. Wavelength and Light Relationship • When visible light passes through prism, it separates out into colors based on wavelength. • When electrons move from ___________ energy levels, they release energy in the form of _______.

  7. Electrons can act like waves! When electrons move from higher energy levels to lower energy levels, they release energy in the form of radiation …. sometimes in the visible spectrum. Electron releases energy (photon). Energy has a particular wavelength. Wavelength may be part of the visible light spectrum.

  8. Electronic Transition • This energy emitted is called a quantum of energy (E). • It is ONLY emitted when electrons drop levels & can be calculated using: • E = hv h = Planks Constant = 6.626 x 10 -34 J*s • This process is known as electronic transition and is measured in Joules.

  9. Atomic Emission Spectrum • like a fingerprint for atoms • passing electric current through gas in a tube energizes the electrons which emit light • When electrons move between energy levels: light emitted has frequency proportional to energychange therefore, each transition produces a line of specific wavelength in the spectrum

  10. Electronic Transition

  11. Check out Fig 5-14, p. 143 • Suppose an e- in its ground state at energy level one (n=1) absorbs enough energy to jump to level two. What type of radiation will it emit when it returns to the ground state? • Which of these series could be detected through observation? • Compare the energy of the Paschen and Balmer series. Who is larger?

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