1. Physics 231: Section 2 The Physics of Astrophysics http://mimas.physics.drexel.edu/phys231 1 Phys 231, Topic 2: The Physics of Astrophysics

2. Two-Body Interaction Phys 231, Topic 2: The Physics of Astrophysics 2

3. Orbits follow conic sections Phys 231, Topic 2: The Physics of Astrophysics 3 Unbound Bound

4. Kepler’s 1 st and 2 nd Laws Phys 231, Topic 2: The Physics of Astrophysics 4 Each purple region has the same area and is swept out in equal time

5. Gravity from an extended (spherical) distribution Phys 231, Topic 2: The Physics of Astrophysics 5 A “sees” mass 1+mass 2 B “sees” only mass 1

6. Rotation curve of the Milky Way Phys 231, Topic 2: The Physics of Astrophysics 6

7. 7 v

8. Waves interfere with one another Phys 231, Topic 2: The Physics of Astrophysics 8

9. The Wave Nature of Light Phys 231, Topic 2: The Physics of Astrophysics 9

10. Electromagnetic Waves Phys 231, Topic 2: The Physics of Astrophysics 10

11. Newton’s Double Prism experiment Phys 231, Topic 2: The Physics of Astrophysics 11

12. The Electromagnetic Spectrum Phys 231, Topic 2: The Physics of Astrophysics 12

13. The Solar Spectrum Phys 231, Topic 2: The Physics of Astrophysics 13

14. SDSS Response Function Phys 231, Topic 2: The Physics of Astrophysics 14

15. Spectral lines of some common elements Phys 231, Topic 2: The Physics of Astrophysics 15

16. Phys 231, Topic 2: The Physics of Astrophysics 16

17. Kirchoff’s Spectroscopy Laws Phys 231, Topic 2: The Physics of Astrophysics 17

18. Doppler Shift Phys 231, Topic 2: The Physics of Astrophysics 18

19. Maxwell-Boltzmann Distribution Phys 231, Topic 2: The Physics of Astrophysics 19

20. The RHS of the SAHA equation Phys 231, Topic 2: The Physics of Astrophysics 20 Solar Densities Earth Atmospheric Densities

21. Ionization fraction of hydrogen Phys 231, Topic 2: The Physics of Astrophysics 21 Solar Earth