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Lab 05

Astronomy 105 Laboratory. Lab 05. Lab Quiz 05. According to Kepler’s 1st Law a planet orbits the sun in an elliptical orbit. Where is the sun located?. On the major axis in the exact center of the ellipse. On the major axis at one of the focus points.

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Lab 05

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  1. Astronomy 105 Laboratory Lab 05

  2. Lab Quiz 05

  3. According to Kepler’s 1st Law a planet orbits the sun in an elliptical orbit. Where is the sun located? • On the major axis in the exact center of the ellipse. • On the major axis at one of the focus points. • On the minor axis halfway between the center and the orbit. • At the perihelion point on the orbit. • At the aphelion point on the orbit.

  4. At what point in it’s orbit is a planet moving the slowest? • perihelion (closest to the sun) • aphelion (farthest from the sun)

  5. Which one of Kepler’s laws was used to find the Sun’s mass? • 1st: Law of Ellipses • 2nd: Law of Equal Areas • 3rd: Harmonic Law

  6. Every chemical element has a unique spectral signature. • True • False • A few elements actually have identical emission lines.

  7. Which one of the following types of spectra has bright lines. • absorption • continuous • dark • emission

  8. Lab 05 Emission Spectra

  9. Color Wavelength Light Waves Wavelength () Red Light– Longer Wavelength, Lower Energy Blue Light – Shorter Wavelength, Higher Energy

  10. Narrow beam of light White Light Source Spectroscope Screen PrismorDiffraction Grating -e narrow slit Spectrum

  11. Kirchhoff’s First Law • Hot, dense gases or solids produce a continuous spectrum. • Example: Light bulb filament Continuous Spectrum

  12. Kirchhoff’s Second Law • Hot, rarefied gas produces an emission line spectrum. • Example: Neon sign Emission Line Spectrum

  13. Kirchhoff’s Third Law • Cool gas in front of a continuous source of light produces an absorption line spectrum. • Example: The Sun Absorption Spectrum

  14. Electric charge - Electrons + Protons Neutrons Nucleus protons/neutrons electrons Atoms +

  15. Hydrogen Atom 5 Energy Levels 4 -e 434 nm 3 2 656 nm -e 1 -e +P 486 nm 410 nm -e -e 400 nm 700 nm

  16. Aluminum Argon Calcium Carbon Helium Hydrogen Iron Krypton Magnesium Neon Nitrogen Oxygen Sodium Sulfur Xenon

  17. How to Excite an Atom Absorption of Light 400 nm 700 nm White Light Source Screen Prism -e Hydrogen Gas

  18. How to Excite an Atom 4 3 400 nm 700 2 White Light Source 1 +P 656 nm Absorption of aPhoton Hydrogen Atom -e -e

  19. How to Excite an Atom 4 3 2 UV 1 +P Collision with Another Particle Hydrogen Atom -e -e -e -e

  20. The End

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