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Astronomy 1020 Stellar Astronomy Spring_2014 Day-11

Astronomy 1020 Stellar Astronomy Spring_2014 Day-11. Exam Sadistics. Metric Ex-1 Number 37 Mean 69.2 StdDev 15.2 Median 73 Mode 79 High 97 Low 37. Course Announcements. Smartworks Chapters 5: Due Mon. 2/17. Lecture Tutorial Light & Atoms : (pg. 65). Work with a partner!

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Astronomy 1020 Stellar Astronomy Spring_2014 Day-11

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  1. Astronomy 1020 Stellar Astronomy Spring_2014 Day-11

  2. Exam Sadistics Metric Ex-1 Number 37 Mean 69.2 StdDev 15.2 Median 73 Mode 79 High 97 Low 37

  3. Course Announcements • Smartworks Chapters 5: Due Mon. 2/17

  4. Lecture Tutorial Light & Atoms: (pg. 65) • Work with a partner! • Read the instructions and questions carefully. • Discuss the concepts and your answers with one another. Take time to understand it now!!!! • Come to a consensus answer you both agree on. • If you get stuck or are not sure of your answer, ask another group.

  5. The spectrum of a cloud of glowing gas contains emission lines. • When viewed through a cloud of gas, a continuous spectrum will have absorption lines.

  6. Lecture Tutorial Types of Spectra: (pg. 63) • Work with a partner! • Read the instructions and questions carefully. • Discuss the concepts and your answers with one another. Take time to understand it now!!!! • Come to a consensus answer you both agree on. • If you get stuck or are not sure of your answer, ask another group.

  7. The wavelengths at which atoms emit and absorb radiation form unique spectral fingerprints for each atom. • They help determine a star’s composition, temperature, and more.

  8. The motion of a light source toward or away from us changes our perception of the wavelength of the waves reaching us. • Doppler effect.

  9. MATH TOOLS 5.2 • If you know the wavelength of light you are observing as well as the wavelength of light the object would be emitting if it were at rest, you can find the speed of the object using the Doppler effect.

  10. Light from approaching objects is blueshifted; the waves crowd together. • Light from receding objects is redshifted; the waves are spaced farther apart.

  11. Concept Quiz—Doppler Shift Hydrogen emits light at  = 656 nm. You see a distant galaxy in which the light from hydrogen has  = 696 nm. This galaxy is • moving toward us. • moving away from us.

  12. Temperature is a measure of the average speed of the motions of atoms. • Kelvin scale: Water freezes/boils at 273 K / 373 K. • Absolute zero is when thermal motion stops.

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