Astronomy and Cosmologies Thus.6.May, week 6, Spring 2010, Zita • Brief Q&A • Light and Spectra • Discuss Tuesday workshops • Online spectra workshop • Caper 45 & 53 (half the class do each, then compare) • Caper 57: Black Body Radiation • Telescopes • Post research updates each week
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Astronomy and Cosmologies Thus.6.May, week 6, Spring 2010, Zita
Astronomy and Cosmologies Thus.6.May, week 6, Spring 2010, Zita. Brief Q&A Light and Spectra Discuss Tuesday workshops Online spectra workshop Caper 45 & 53 (half the class do each, then compare) Caper 57: Black Body Radiation Telescopes Post research updates each week. - PowerPoint PPT Presentation
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Astronomy and CosmologiesThus.6.May, week 6, Spring 2010, Zita
• Brief Q&A• Light and Spectra• Discuss Tuesday workshops• Online spectra workshop • Caper 45 & 53 (half the class do each, then compare)
• Caper 57: Black Body Radiation
• Telescopes
• Post research updates each week
Guiding Questions for Ch.5: Light
* How can we measure the speed of light?
* How do we know that light is an electromagnetic wave?
* How is an object’s temperature related to the radiation that it emits?
* How is an object’s temperature related to the ENERGY that it emits?
(What is the evidence that light has both wave and particle properties?)
* How can astronomers detect an object’s chemical composition by studying the light it emits?
* How does an object’s motion affect the light we receive from it?
Measuring the speed of light
Ole Roemer’s astronomical measurements Modern lab measurements based on
ca. 1676 Fizeau-Foucault method
Light as an electromagnetic wave
Energy = hf = hc/
Spectrum of white light
Notice the range of visual light is about 400-700 nm (4000–7000 Å)
Infrared light has wavelengths longer than 700 nm;
Finally, a few words about TelescopesFirst, you don’t have to take the Ch.6 online quiz on telescopes (except Penelope and Caitlin, since this is your research project).
Do take the Ch.5 quiz on light.
Two main types of telescopes:
Refracting (bending light) and Reflecting
Virtually all modern telescopes are reflecting: why?
Ground-based telescopes can do great
… especially with adaptive optics
CCDs = revolutionary light bucket brigades
Radio telescopes can see where others can’t
Research Updates
1. Post your research updates on Moodle tomorrow• What have you observed?• How has your hypothesis developed, based on
your tests?• State your best understanding concisely• Articulate your outstanding questions clearly
2. Read the Research Updates of other teams. Give them feedback.
3. Would you like a Poster-making workshop before the Science Carnival?