http://www.highpoint.edu/ ~afuller/PHY-1050 • Pre-Lecture Quiz: – MasteringAstronomy Ch15 pre-lecture quiz due February 17 – MasteringAstronomy Ch16 pre-lecture quiz due March 10 • Homework: – MasteringAstronomy Ch4 assignment due February 8 – MasteringAstronomy Ch5 assignment due February 15 – MasteringAstronomy Ch14 assignment due March 1 • Midterm 1: [TTh] Feb 12 / [MW] Feb 13 – Covers chapters 1, 3, 4, 5, and Appendix C. – Bring a calculator. I will not have extras. Cell phones are not allowed. – Test will be scantron, so bring a pencil. I will not have extras. – Have Lecture-Tutorials workbook ready to turn in before test.
http:// www.highpoint.edu /~ afuller /PHY-1050. Pre -Lecture Quiz: MasteringAstronomy Ch15 pre-lecture quiz due February 17 MasteringAstronomy Ch16 pre-lecture quiz due March 10 Homework: MasteringAstronomy Ch4 assignment due February 8 - PowerPoint PPT Presentation
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http://www.highpoint.edu/~afuller/PHY-1050
• Pre-Lecture Quiz:– MasteringAstronomy Ch15 pre-lecture quiz due February 17– MasteringAstronomy Ch16 pre-lecture quiz due March 10
• Homework: – MasteringAstronomy Ch4 assignment due February 8– MasteringAstronomy Ch5 assignment due February 15– MasteringAstronomy Ch14 assignment due March 1
• Midterm 1: [TTh] Feb 12 / [MW] Feb 13– Covers chapters 1, 3, 4, 5, and Appendix C.– Bring a calculator. I will not have extras. Cell phones are not allowed. – Test will be scantron, so bring a pencil. I will not have extras.– Have Lecture-Tutorials workbook ready to turn in before test.
Introduction to Spectra
• What are the three basic type of spectra?– Continuous spectrum, emission line spectrum,
absorption line spectrum • How does light tell us what things are made
of?– Each atom has a unique fingerprint.– We can determine which atoms something is
made of by looking for their fingerprints in the spectrum.
What are the three basic types of spectra?
• Spectra of astrophysical objects are usually combinations of these three basic types.
Continuous Spectrum
• The spectrum of a common (incandescent) light bulb spans all visible wavelengths, without interruption.
Emission Line Spectrum
• A thin or low-density cloud of gas emits light only at specific wavelengths that depend on its composition and temperature, producing a spectrum with bright emission lines.
Absorption Line Spectrum
• A cloud of gas between us and a light bulb can absorb light of specific wavelengths, leaving dark absorption lines in the spectrum.
Three Types of Spectrahttp://www.highpoint.edu/~afuller/PHY-1050/textbook/05_ProductionOfAbsorpLines.htm