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LECTURE 7, SEPTEMBER 14, 2010

LECTURE 7, SEPTEMBER 14, 2010. ASTR 101, SECTION 3 INSTRUCTOR, JACK BRANDT jcbrandt@unm.edu. Question 1. a) light passing through lenses can be absorbed or scattered. b) large lenses can be very heavy. c) large lenses are more difficult to make.

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LECTURE 7, SEPTEMBER 14, 2010

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  1. LECTURE 7, SEPTEMBER 14, 2010 ASTR 101, SECTION 3 INSTRUCTOR, JACK BRANDT jcbrandt@unm.edu ASTR 101-3, FALL 2010

  2. ASTR 101-3, FALL 2010

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  8. Question 1 a)light passing through lenses can be absorbed or scattered. b)large lenses can be very heavy. c)large lenses are more difficult to make. d)mirrors can be computer controlled to improve resolution. e)reflecting telescopes aren’t affected by the atmosphere as much. Modern telescopes use mirrors rather than lenses for all of these reasons EXCEPT

  9. Question 1 a)light passing through lenses can be absorbed or scattered. b)large lenses can be very heavy. c)large lenses are more difficult to make. d)mirrors can be computer controlled to improve resolution. e)reflecting telescopes aren’t affected by the atmosphere as much. Modern telescopes use mirrors rather than lenses for all of these reasons EXCEPT Reflecting instruments like the KECK telescopes can be made larger, and more capable, than refractors.

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  13. Question 4 a) larger telescopes & longer wavelengths. b) infrared light. c)larger telescopes & shorter wavelengths. d)lower frequency light. e)visible light. Resolution is improved by using

  14. Question 4 a) larger telescopes & longer wavelengths. b) infrared light. c)larger telescopes & shorter wavelengths. d)lower frequency light. e)visible light. Resolution is improved by using Diffraction limits resolution; larger telescopes and shorter-wave light produces sharper images.

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  16. Question 2 a) the quality of the telescope’s optics. b) the transparency of a telescope’s lens. c) the sharpness of vision of your eyes. d) the image quality due to air stability. e) the sky’s clarity & absence of clouds. Seeing in astronomy is a measurement of

  17. Smeared overall image of star Point images of a star Question 2 a) the quality of the telescope’s optics. b) the transparency of a telescope’s lens. c) the sharpness of vision of your eyes. d) the image quality due to air stability. e) the sky’s clarity & absence of clouds. Seeing in astronomy is a measurement of “Good Seeing” occurs when the atmosphere is clear and the air is still. Turbulent air produces “poor seeing,” and fuzzier images.

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  21. Question 8 a)observations can be made day & night. b)we can see objects that don’t emit visible light. c)radio waves are not blocked by interstellar dust. d)they can be linked to form interferometers. e)All of the above are true. Radio telescopes are useful because

  22. Question 8 a)observations can be made day & night. b)we can see objects that don’t emit visible light. c)radio waves are not blocked by interstellar dust. d)they can be linked to form interferometers. e)All of the above are true. Radio telescopes are useful because The Very Large Array links separate radio telescopes to create much better resolution.

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  25. Question 9 a)pulsars & black holes. b)from locations on the ground. c)hot stars & intergalactic gas. d)neutron stars. e) cool stars & star-forming regions. Infrared telescopes are very useful for observing

  26. Question 9 a)pulsars & black holes. b)from locations on the ground. c)hot stars & intergalactic gas. d)neutron stars. e) cool stars & star-forming regions. Infrared telescopes are very useful for observing Infrared images of star-forming “nurseries” can reveal objects still shrouded in cocoons of gas and dust.

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  30. REVIEW-CHAPTER 0 • Foundations of Astronomy • Scientific Method, Powers of 10 • Celestial Sphere, Seasons • Angles, Ecliptic • Precession • Moon Phases, Eclipses • Parallax ASTR 101-3, FALL 2010

  31. REVIEW, CHAPTER 1 • Geocentric vs. Heliocentric Solar System • Famous Names in Historical Astronomy & Their Contributions • Copernicus, Galileo, Tycho, Kepler, Newton • Retrograde Motion, Venus Phases • Kepler’s Laws and the AU • Newton’s Laws & Gravitation • Orbits, Masses ASTR 101-3, FALL 2010

  32. REVIEW, CHAPTER 2 • Light and Its Importance in Astronomy • Wave description vs. Photons • Electromagnetic (EM) Spectrum • Atmospheric Transmission & Windows • Atoms, Absorption & Emission of Photons • Uses of Spectra in Astronomy • Doppler Effect ASTR 101-3, FALL 2010

  33. REVIEW, CHAPTER 3 • Optical Telescopes, Basic Types • Light Gathering Power • Resolving Power or Resolution • Atmospheric Effects • Radio Telescopes • Infrared (IR) Images • X-Ray Images ASTR 101-3, FALL 2010

  34. TEST NO. 1, SEPTEMBER 16, 2010 • Multiple Choice, 40 Questions • Paper Copy Plus Bubble Sheet • Paper Copy Will Be Color Coded • Identification Number Is Your Banner Number, Code It In As “Identification Number” Starting With Column A • BRING A NO. 2 PENCIL ASTR 101-3, FALL 2010

  35. TEST NO. 1, SEPTEMBER 16, 2010 • Bring A No. 2 Pencil • Circle Your Answer On the Paper Copy And Fill In The Bubble Sheet • Turn In Both Copies So The Different Color Tests Are Graded With The Correct Answer Sheet! • BRING A NO. 2 PENCIL! ASTR 101-3, FALL 2010

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