1. Questions: What is a continuous spectrum?
What is a bright line spectrum?
What is a dark line spectrum?
What does the spectrum tell you about the Sun?
What does the bumper sticker mean?
If the background on this bumper-sticker
appears red, you’re going way too slow!

2. Spectroscope
Separates light into a wide spectrum of colors.

3. Most of what is known about stars comes from spectral studies.
There are 3 kinds of visible spectra:
Continuous
Bright-line
Dark-line

4. Continuous Spectrum
– unbroken band of colors from a source sending out all visible wavelengths.

5. Continuous Spectrum
- can come from a (hot) glowing solid, a glowing liquid or a glowing gas (star).

6. Bright-line Spectrum
– also called an emission spectrum, is a series of unevenly spaced lines of different colors and brightness.
Hydrogen emission spectrum Sd

7. Bright-line Spectrum
- Every element has its own unique bright-line spectrum, like a fingerprint.
Helium emission spectrum s

8. Bright-line Spectrum are created by…
Florescent lights

9. Bright-line Spectrum are created by…
Northern & Southern lights

10. Bright-line Spectrum are created by…
Nebula

11. Dark-line Spectrum
– a continuous spectrum with dark lines where light has been absorbed. (absorption spectrum)
Helium absorption spectrum

12. Dark-line Spectrum
Are produced by stars.

13. Dark-line Spectrum
The dark lines are in the exact same place as the bright lines would be for the same element in a bright-line spectrum.
Helium absorption spectrum

14. Dark-line Spectrum
The dark lines are formed when light passes through a cooler gas. The dark lines tell us what gases are in the atmospheres of stars and planets.
Helium absorption spectrum

15. Stars’ (dark-line) spectra.
Bright-line spectrum
Hydrogen emission spectrum
Stars’ (dark-line) spectra.
Blueshift
Redshift

16. Periodic Table & Spectrum

17. Hydrogen & Emission Spectrum

18. Hydrogen & Absorption Spectrum

19. Helium & Emission Spectrum

20. Helium & Absorption Spectrum

21. Fraunhofer Lines

22. To Do Today Complete page 1 before class on Monday.
Read through rest of packet.
So you know what we will be doing on Monday.