Astronomy
1st Edition
ISBN: 9781938168284
Author: Andrew Fraknoi; David Morrison; Sidney C. Wolff
Publisher: OpenStax
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Textbook Question
Chapter 6, Problem 22E
Suppose you are looking for sites for a visible-light observatory, an infrared observatory, and a radio observatory. What are the main criteria of excellence for each? What sites are actually considered the best today?
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Chapter 6 Solutions
Astronomy
Ch. 6 - What are the three basic components of a modern...Ch. 6 - Name the two spectral windows through which...Ch. 6 - List the largest-aperture single telescope...Ch. 6 - When astronomers discuss the apertures of their...Ch. 6 - The Hooker telescope at Palomar Observatory has a...Ch. 6 - What is meant by “reflecting” and “refracting”...Ch. 6 - Why are the largest visible-light telescopes in...Ch. 6 - Compare the eye, photographic film, and CCDs as...Ch. 6 - What is a charge-coupled device (CCD), and how is...Ch. 6 - Why is it difficult to observe at infrared...
Ch. 6 - Radio and radar observations are often made with...Ch. 6 - Look back at Figure 6.18 of Cygnus A and read its...Ch. 6 - Why do astronomers place telescopes in Earth’s...Ch. 6 - What was the problem with the Hubble Space...Ch. 6 - Describe the techniques radio astronomers use to...Ch. 6 - What kind of visible-light and infrared telescopes...Ch. 6 - Describe one visible-light or infrared telescope...Ch. 6 - What happens to the image produced by a lens if...Ch. 6 - What would be the properties of an ideal...Ch. 6 - Many decades ago, the astronomers on the staff of...Ch. 6 - The largest observatory complex in the world is on...Ch. 6 - Suppose you are looking for sites for a...Ch. 6 - Radio astronomy involves wavelengths much longer...Ch. 6 - The dean of a university located near the ocean...Ch. 6 - What is the area, in square meters, of a 10-m...Ch. 6 - Approximately 9000 stars are visible to the naked...Ch. 6 - Theoretically (that is, if seeing were not an...Ch. 6 - In broad daylight, the size of your pupil is...Ch. 6 - How much more light can be gathered by a telescope...Ch. 6 - How much more light can the Keck telescope (with...Ch. 6 - People are often bothered when they discover that...Ch. 6 - Telescopes can now be operated remotely from a...Ch. 6 - The HST cost about $1.7 billion for construction...Ch. 6 - How much more light can the James Webb Space...Ch. 6 - The Palomar telescope’s 5-m mirror weighs 14.5...
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- Why is it difficult to observe at infrared wavelengths? What do astronomers do to address this difficulty?arrow_forwardWhat would be the properties of an ideal astronomical detector? How closely do the actual properties of a CCD approach this ideal?arrow_forwardWhat are the different types of remote spectroscopy? List them all with a explanationarrow_forward
- level an ther will such radars disturb such radio astronomy measurements 4. If the intensity of the Sun peaks in the optical range, at a frequency of about 3:4 x 10 Hz, what is the temperature of the Sun? Use the Wien displacement law (1.25). If all of the power is emitted only between 3 and 4 x 10 Hz, how many photons per cm² arrive at the earth when the Sun is directly overhead? What is the power received on earth per cm³? A value for the solar power is 135mW per cm². How does this compare to your calculation?arrow_forwardWhat is the ratio of the light-gathering power of a 10-meter telescope to that of a 1‑meter telescope? a. 10 to 1 b. 1 to 10 c. 100 to 1 d. 1 to 100 e. 3.2 to 1arrow_forwardWhat is the wavelength in meters observed with a frequency of (4.5x10^15)? Answer with 2 significant figures and it must be in scientific notation. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: Answer x10 unitsarrow_forward
- The HST cost about $1.7 billion for construction and $300 million for its shuttle launch, and it costs $250 million per year to operate. If the telescope lasts for 20 years, what is the total cost per year? Per day? If the telescope can be used just 30% of the time for actual observations, what is the cost per hour and per minute for the astronomer’s observing time on this instrument? What is the cost per person in the United States? Was your investment in the Hubble Space telescope worth it?arrow_forwardWhat kind of visible-light and infrared telescopes on the ground are astronomers planning for the future? Why are they building them on the ground and not in space?arrow_forwardWhy do astronomers place telescopes in Earth’s orbit? What are the advantages for the different regions of the spectrum?arrow_forward
- Explain TWO of the applications using correct terminology and connecting it to concepts in this unit. Option #1: A soap bubble is exposed to white light, and yet you see distinct colors. Why do you see different colors? Option #2: The star Mizar is a double star that only appears as two distinct stars when resolved by a telescope. Explain why. Option #3: Why is the sky blue? Option #4: What is the importance of Photo 51 and how was it made? Option #5: Why can we see more detail using an electron microscope vs an optical light microscope? Why don't you use them in your SBI4U0 class? Option #6: The MLB uses authentication holograms on their official merchandise. What is a hologram and how is it made? Option #7: Explain how the double slit experiment demonstrates the inseparability of the wave and particle nature of light and other quantum particles.arrow_forwardWhen astronomers discuss the apertures of their telescopes, they say bigger is better. Explain why. a) A wider aperture can observe a significantly larger portion of the sky. b) A wider aperture makes a telescope easier to aim. c) A wider aperture allows a telescope to collect more light, so it can produce images with higher resolution. d) A wider aperture allows a telescope to collect more light, so it can detect fainter light sources.arrow_forwardThe spectrum of a typical star shows absorption lines at different wavelengths than their laboratory values. If the observed wavelength is greater than its laboratory value of 656.3 nm, one can conclude that ... A. The separation between Earth and the star is decreasing. B. The separation between Earth and the star is increasing. O C. The separation between Earth and the star is unchanging D. No conclusion is possible.arrow_forward
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