1. Spectra

2. Newton – split sunlight Actually sunlight is not continuous – there are missing wavelengths -- Fraunhofer lines – explanation will relate to the info in this chapter

3. Chemists split light by using prisms or diffraction gratings You can look at the spectral lines of fluorescent light bulbs by using a “CD” – the lines on the CD are comparable to a diffraction grating

4. Flame tests aand spectra tubes

5. Pg 136 Spectra White light – continuous spectrum Heated matter also continuous 1879 http://members.misty.com/don/bulb1.html#vvg

6. Spectra of gaseous atoms – not continuous Light from fluorescent bulb reflected Off CD - NOT conintuous Mercury vapor uncoated Buying light bulbs

7. Color related to temperatureFluorescent bulbs – color rated by temp 3000K Kitchen/bath 4200 K cool white 5000K sunshine 6500 K Daylight Higher temp – more blue – more balanced Lower temperatures, less blue – more “yellowish” GE black light 368 nm

9. Hydrogen spectra lines Light separated by prism or Diffraction grating

10. Explanation of these spectral lines H atom – 1 p 1e Review Ch 2 sec 2, Atom video (WOC) Thomson’s electron, Rutherford nuclear model Bohr model of H atom – to explain spectra Proton surrounded by electron Electron revolve around proton At specific distances With specific energies Can move from energy level to energy level

11. Bohr MODEL Thomson Absorption Emission QM Explanation of H spectral lines