1. Newton studies the Sun’s spectrum

2. Sketch of an atom

3. Wave of electromagnetic energy
Figure 3.1

4. Photons move at the speed of light
Figure 3.2

5. Wavelength-distance
between crests
Figure 3.3

6. White light spread into a spectrum
Figure 3.4

7. The electromagnetic spectrum
Figure 3.5

8. Heat affects wavelength
Figure 3.6

9. An atom’s structure
Figure 3.7

10. Electromagnetic radiation
Figure 3.8

11. Absorption of light
Figure 3.9

12. How a spectroscope forms a spectrum
Figure 3.10

13. Electron orbits in hydrogen and helium
Figure 3.11

14. Emission of light
Figure 3.12

15. Emission spectra of hydrogen and helium
Figure 3.13A

16. A hot, low density gas creates an emission spectrum
Figure 3.13B

17. Gas and heat
Figure 3.14

18. Types of spectra
Figure 3.15

19. Spectrum of a comet
Figure 3.16

20. Radio and X-ray spectrum
Figure 3.17

21. Doppler shift
Figure 3.18

22. Atmospheric absorption
Figure 3.19