Astronomy
1st Edition
ISBN: 9781938168284
Author: Andrew Fraknoi; David Morrison; Sidney C. Wolff
Publisher: OpenStax
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Textbook Question
Chapter 6, Problem 19E
What would be the properties of an ideal astronomical detector? How closely do the actual properties of a CCD approach this ideal?
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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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- 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 diameter telescope is needed to resolve the separation between an Earth-like planet and its star at 550 nm if the linear separation between them is 1 AU and the star system is 4 pc from Earth? (Give your answer in m.) marrow_forwardHow is remote spectroscopy used? What are the step by step method? What are the machines and equipment used?arrow_forward
- Remote Spectroscopy. Spectrometers mounted on aircraft and satellites have been used to obtain spectralinformation about the earth. How do these systems work? Cite specific uses of these remote spectroscopytechniques.arrow_forwardThe James Webb Telescope is an important innovation in Astronomy and its implementation was first explained to the public during the timeline of our course this summer. Prepare an explanation which includes the following: What is the James Webb Telescope? Include a description of the tool itself and a brief history. What is the importance/significance of this tool for future astronomical studies?arrow_forwardExplain spectroscopy as a study within astronomy. Include the following information: how the process is conducted, what information it can provide, and why it is essential to the study of astronomy.arrow_forward
- 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?arrow_forwardWhat is the ratio of the angular resolution limit of Keck to the angular resolution limit of HST? (Assume they are both observing at the same wavelength.) [Compute the relevant ratio Keck/HST, express as a decimal, and enter below.] HST orbits at an altitude of 559 km above the Earth's surface. Assume its orbit is circular. Compute its orbital period in hours. Compute its orbital speed (in km/s).arrow_forwardGiven the figure, determine the Vernier caliper measurement. Express your answer in centimeter. The red mark indicates where the main scale and Vernier scale coincides. 1/128in 5, 7 80 0.05mm ói 2 3 4 5 6 7 8 9 1o O 3.9225 O 3.9045 3.645 O 3.945arrow_forward
- 1. How do I calculate LOD (limit of detection) when I have a negative slope? 2. Can LOD be negative?arrow_forwardA remote-sensing payload operates in the infrared part of the spectrum (lambda = 1 micrometer). If it has an aperture diameter of 1 m, what would its resolution be (in meters) while operating in a geosynchronous orbit (35,786 km)? What formula would I use to find this?arrow_forwardThe Giant Magellan Telescope is a new telescope being built in Chile with a mirror 25 meters in diameter. Part 1: If you neglect the impact of Earth's atmosphere, what is the angular resolution limit (diffraction limit or resolving power) of this telescope in green light (500 nm)? Give your answer in arcseconds. Part 2: The current Magellan telescope has a mirror 6 meters in diameter. How much more light per second will the Giant Magellan capture compared to the current Magellan?arrow_forward
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