1. ASTR 1101-001 Spring 2008 Joel E. Tohline, Alumni Professor 247 Nicholson Hall [Slides from Lecture18]

2. A Few Additional Ideas from Chapter 4 Universal Effects of Gravitation Center of Mass (and related concepts) Tides –Influence of the Moon on the Earth –Influence of the Sun on the Earth –Influence of the Earth on the Moon –Interactions between Galaxies

4. A Few Additional Ideas from Chapter 4 Universal Effects of Gravitation Center of Mass (and related concepts) Tides –Influence of the Moon on the Earth –Influence of the Sun on the Earth –Influence of the Earth on the Moon –Interactions between Galaxies

5. A Few Additional Ideas from Chapter 4 Universal Effects of Gravitation Center of Mass (and related concepts) Tides [ differential effects of gravitational acceleration ] –Influence of the Moon on the Earth –Influence of the Sun on the Earth –Influence of the Earth on the Moon –Interactions between Galaxies

7. A Few Additional Ideas from Chapter 4 Universal Effects of Gravitation Center of Mass (and related concepts) Tides –Influence of the Moon on the Earth –Influence of the Sun on the Earth –Influence of the Earth on the Moon –Interactions between Galaxies

11. A Few Additional Ideas from Chapter 4 Universal Effects of Gravitation Center of Mass (and related concepts) Tides –Influence of the Moon on the Earth –Influence of the Sun on the Earth –Influence of the Earth on the Moon –Interactions between Galaxies

15. A Few Additional Ideas from Chapter 4 Universal Effects of Gravitation Center of Mass (and related concepts) Tides –Influence of the Moon on the Earth –Influence of the Sun on the Earth –Influence of the Earth on the Moon –Interactions between Galaxies

16. A Few Additional Ideas from Chapter 4 Universal Effects of Gravitation Center of Mass (and related concepts) Tides –Influence of the Moon on the Earth –Influence of the Sun on the Earth –Influence of the Earth on the Moon –Interactions between Galaxies

18. Chapter 5: Nature of Light Speed of Light –Finite –How is the speed measured? Colors of (visible) Light –Rainbow –Concept of spectrum (intensity vs. color) –Color identifies wavelength (and frequency) Entire electromagnetic spectrum

19. Chapter 5: Nature of Light Speed of Light –Finite –How is the speed measured? Colors of (visible) Light –Rainbow –Concept of spectrum (intensity vs. color) –Color identifies wavelength (and frequency) Entire electromagnetic spectrum

20. Chapter 5: Nature of Light Speed of Light –Finite –How is the speed measured? Colors of (visible) Light –Rainbow –Concept of spectrum (intensity vs. color) –Color identifies wavelength (and frequency) Entire electromagnetic spectrum

21. Chapter 5: Nature of Light Speed of Light –Finite –How is the speed measured? Colors of (visible) Light –Rainbow –Concept of spectrum (intensity vs. color) –Color identifies wavelength (and frequency) Entire electromagnetic spectrum

24. Chapter 5: Nature of Light Speed of Light –Finite –How is the speed measured? Colors of (visible) Light –Rainbow –Concept of spectrum (intensity vs. color) –Color identifies wavelength (and frequency) Entire electromagnetic spectrum

25. Chapter 5: Nature of Light Speed of Light –Finite –How is the speed measured? Colors of (visible) Light –Rainbow –Concept of spectrum (intensity vs. color) –Color identifies wavelength (and frequency) Entire electromagnetic spectrum

27. Chapter 5: Nature of Light Speed of Light –Finite –How is the speed measured? Colors of (visible) Light –Rainbow –Color identifies wavelength (and frequency) –Concept of spectrum ( intensity vs. wavelength ) Entire electromagnetic spectrum

28. Wavelength and Frequency Wavelength = Frequency = c = speed of light = c

29. Chapter 5: Nature of Light Speed of Light –Finite –How is the speed measured? Colors of (visible) Light –Rainbow –Color identifies wavelength (and frequency) –Concept of spectrum ( intensity vs. wavelength ) Entire electromagnetic spectrum

33. Chapter 5: Nature of Light Speed of Light –Finite –How is the speed measured? Colors of (visible) Light –Rainbow –Color identifies wavelength (and frequency) –Concept of spectrum ( intensity vs. wavelength ) Entire electromagnetic spectrum