LECTURE 7, SEPTEMBER 14, 2010 ASTR 101, SECTION 3 INSTRUCTOR,
JACK BRANDT [email protected] 1ASTR 101-3, FALL 2010
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Question 1 Modern telescopes use mirrors rather than lenses for
all of these reasons EXCEPT 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 arent
affected by the atmosphere as much.
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Question 1 Modern telescopes use mirrors rather than lenses for
all of these reasons EXCEPT 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 arent
affected by the atmosphere as much. Reflecting instruments like the
KECK telescopes can be made larger, and more capable, than
refractors.
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Question 4 Resolution is improved by using a) larger telescopes
& longer wavelengths. b) infrared light. c) larger telescopes
& shorter wavelengths. d) lower frequency light. e) visible
light.
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Question 4 Resolution is improved by using a) larger telescopes
& longer wavelengths. b) infrared light. c) larger telescopes
& shorter wavelengths. d) lower frequency light. e) visible
light. Diffraction limits resolution; larger telescopes and
shorter- wave light produces sharper images.
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a) the quality of the telescopes optics. b) the transparency of
a telescopes lens. c) the sharpness of vision of your eyes. d) the
image quality due to air stability. e) the skys clarity &
absence of clouds. Seeing in astronomy is a measurement of Question
2
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Seeing in astronomy is a measurement of Question 2 Good Seeing
occurs when the atmosphere is clear and the air is still. Turbulent
air produces poor seeing, and fuzzier images. a) the quality of the
telescopes optics. b) the transparency of a telescopes lens. c) the
sharpness of vision of your eyes. d) the image quality due to air
stability. e) the skys clarity & absence of clouds. Point
images of a star Smeared overall image of star
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Question 8 Radio telescopes are useful because a) observations
can be made day & night. b) we can see objects that dont 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.
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Question 8 Radio telescopes are useful because a) observations
can be made day & night. b) we can see objects that dont 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. The Very Large Array links separate radio telescopes to
create much better resolution.
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Question 9 Infrared telescopes are very useful for observing a)
pulsars & black holes. b) from locations on the ground. c) hot
stars & intergalactic gas. d) neutron stars. e) cool stars
& star-forming regions.
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Question 9 Infrared telescopes are very useful for observing 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 images of star-forming
nurseries can reveal objects still shrouded in cocoons of gas and
dust.
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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 201030
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REVIEW, CHAPTER 1 Geocentric vs. Heliocentric Solar System
Famous Names in Historical Astronomy & Their Contributions
Copernicus, Galileo, Tycho, Kepler, Newton Retrograde Motion, Venus
Phases Keplers Laws and the AU Newtons Laws & Gravitation
Orbits, Masses ASTR 101-3, FALL 201031
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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 201032
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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
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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
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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 201035