Understanding Our Universe
3rd Edition
ISBN: 9780393614428
Author: PALEN, Stacy, Kay, Laura, Blumenthal, George (george Ray)
Publisher: W.w. Norton & Company,
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Chapter 4, Problem 25QAP
To determine
The reason why it is difficult to build the refractor having aperture twice the largest refractor.
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(a) How far apart must two objects be on the moon to be resolved by the human eye? Take the diameter of the pupil of the eye to be 6 mm, the wavelength
of the light to be 500 nm, and the distance from the earth to the moon to be 380 000 km.
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(b) How far apart must the objects be on the moon be to be resolved by a telescope that has a mirror diameter of 6 m?
Number
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A Keplerian telescope has an objective lens of diameter 12 cm and focal length +90 cm, and
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The Hiltner Telescope at the MDM Observatory (on Kitt Peak, Arizona) has an aperture D = 2.4m. Its Cassegrain focus has an f-number f/7. What is the focal length F and plate scale s?
The Mayall telescope at Kitt Peak National Observatory (also on Kitt Peak) has an aperture D = 4.0m. Its prime focus has an f-number f/2.7, its Cassegrain focus has f/8 and its Coudé focus has f/160. What is the focal length and plate scale for each of these three foci?
The Keck Telescope (on Mauna Kea, Hawaii) has an aperture D = 10.0 m. Its Cassegrain focus has f/15. What is the focal length and plate scale?
Chapter 4 Solutions
Understanding Our Universe
Ch. 4.1 - Prob. 4.1CYUCh. 4.2 - Prob. 4.2CYUCh. 4.3 - Prob. 4.3CYUCh. 4 - Prob. 1QAPCh. 4 - Prob. 2QAPCh. 4 - Prob. 3QAPCh. 4 - Prob. 4QAPCh. 4 - Prob. 5QAPCh. 4 - Prob. 6QAPCh. 4 - Prob. 7QAP
Ch. 4 - Prob. 8QAPCh. 4 - Prob. 9QAPCh. 4 - Prob. 10QAPCh. 4 - Prob. 11QAPCh. 4 - Prob. 12QAPCh. 4 - Prob. 13QAPCh. 4 - Prob. 14QAPCh. 4 - Prob. 15QAPCh. 4 - Prob. 16QAPCh. 4 - Prob. 17QAPCh. 4 - Prob. 18QAPCh. 4 - Prob. 19QAPCh. 4 - Prob. 20QAPCh. 4 - Prob. 21QAPCh. 4 - Prob. 22QAPCh. 4 - Prob. 23QAPCh. 4 - Prob. 24QAPCh. 4 - Prob. 25QAPCh. 4 - Prob. 26QAPCh. 4 - Prob. 27QAPCh. 4 - Prob. 28QAPCh. 4 - Prob. 29QAPCh. 4 - Prob. 30QAPCh. 4 - Prob. 31QAPCh. 4 - Prob. 32QAPCh. 4 - Prob. 33QAPCh. 4 - Prob. 34QAPCh. 4 - Prob. 35QAPCh. 4 - Prob. 36QAPCh. 4 - Prob. 37QAPCh. 4 - Prob. 38QAPCh. 4 - Prob. 39QAPCh. 4 - Prob. 40QAPCh. 4 - Prob. 41QAPCh. 4 - Prob. 42QAPCh. 4 - Prob. 43QAPCh. 4 - Prob. 44QAPCh. 4 - Prob. 45QAP
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- A binary star system has an angular separation between the two stars of 2.9 x 10-5 radians. If 2 = 6.6 x 10-7 m, what is the smallest aperture (diameter) telescope that may be used to resolve the two stars? Write your answer in cm.arrow_forwardWhat is the field of view when a CCD detector of dimensions 15 mm x 15 mm is used with a telescope that has a diameter of 1 metre and a focal ratio f/10? Express your answer in arcseconds x arcseconds. Choose the answer below that best matches your answer. Select one: О а. 68 x 68 оb. 698 х 698 С. 125 х 125 O d. 243 x 243 е. 309 х 309arrow_forwardThe Thirty Meter Telescope is a new telescope proposed for the top of the volcano Maunakea that is opposed by many native Hawaiians. Its circular mirror will be 30 m in diameter. In December 2028, Mars will be at its closest approach to Earth (this happens every three years). An astronomer has predicted that, when finished, the telescope will be able to resolve objects that are approximately 2.0 km across on Mars assuming perfect viewing conditions. Approximately how far away is Mars from the Earth when this happens? The dominate wavelengths of visible light coming from Mars are in the range of 500 nm to 700 nm.arrow_forward
- If you want to achieve a magnification of about 110x to 125x in the M603 telescope, what eyepiece do you need to use? a The 5mm eyepiece b The 7mm eyepiece c The 24mm eyepiece d The 31mm eyepiece e The 13mm eyepiecearrow_forwardThe primary optical element of the Hubble Space Telescope (HST) is 3.2 m in diameter and has a focal length of 62 m. (Treat it as a simple, single lens for this homework) The telescope is aimed at Jupiter and the collected light is focused onto a sensitive Charge Coupled Device (CCD) detector, similar to what is in a digital camera. Each pixel in the detector is a 21 μm x 21 μm square, and the full CCD is 4096 x 4096 pixels. Thus the CCD is about one square inch in size. The HST is in orbit very close to the Earth (compared to other distances in the Solar system). Size of Jupiter: 139,820 km in diameter Distance to Jupiter: 778 million km How many pixels in diameter is Jupiter's image on CCD?arrow_forwardUse diagrams to describe how the following types of telescope collect light from a single point- source at infinity, and form a focused image in the focal plane: (i) refractor (ii) Newtonian reflector (iii) catadioptric telescope. A telescope with focal ratio f/10 and diameter D = 0.5 m has a CCD detector placed at its focal plane. The CCD chip has dimensions 3 × 3 cm2 . Determine the size of the field of view that can be imaged on the CCD detector in units of arcminutes × arcminutes, and state whether or not an image of the full moon can be captured. Assume the angular diameter of the full moon is 30 arcminutes.arrow_forward
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