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Chapter 6 Review Terms in this set (27)What is the purpose of adaptive optics? to eliminate the distorting effects of atmospheric turbulence for telescopes on the ground True or false: A radio telescope and an optical telescope of the same size have the same angular resolution. False What does better angular resolution mean? you can see smaller details True or false: X rays from astronomical objects can only be detected from telescopes in space. True What is interferometry? It is the analysis of interference patterns of light from different telescopes to enable combining the light into one image. Telescopes operation at this wavelength must be cooled to observe faint astronomical objects extreme infrared The largest effective telescope, created by radio interferometry, is the size of the earth. What do we mean by the diffraction limit of a telescope? It is the best angular resolution the telescope could achieve with perfect optical quality and in the absence of atmospheric distortion. Improving the spectral resolution of a spectrograph comes at the expense of increased exposure time Which of the following is not a good reason to place observatories on remote mountain tops? to be able to observe at radio wavelengths True or false: Most astronomical objects emit light over a broad range of wavelengths. True In what wavelength range was interferometry first routinely used? radio True or false: The Hubble Space Telescope is famous because, at least at the time of its launch, it was the largest visible light telescope ever built. False At which wavelength range is there no current or planned space observatory? radio What do astronomers mean by light pollution? Light pollution refers to light used for human activities that brightens the sky and hinders astronomical observations What is a light curve? a plot showing how an object's intensity varies with time How does adaptive optics improve the performance of a telescope? It rapidly adjusts the shape of the telescope mirror to compensate for the effects of turbulence. What causes stars to twinkle? bending of light rays by turbulent layers in the atmosphere What is meant by spectral resolution? It is a measure of how close two spectral lines can be distinguished. How does interferometry improve the capabilities of a telescope? it improves the angular resolution. Which of the following statements about light focusing is not true? The focal plane of a reflecting telescope is always located within a few inches of the primary mirror. Which of the following is a principal advantage of CCDs over photographic film? CCDs capture a much higher percentage of incoming photons than does film. True or false: X-ray telescope mirrors are very similar to optical telescope mirrors. False True or false: A larger telescope will always have a higher spectral resolution than a smaller telescope when observing at the same wavelength. False Suppose the angular separation of two stars is smaller than the angular resolution of your eyes. How will the stars appear to your eyes? The two stars will look like a single point of light. Currently, the largest optical telescope mirrors have a diameter of 10 m. The largest optical telescopes are designed to have large collecting area and high angular resolution - the magnification is of secondary importance. Sets with similar termsChapter 6 Homework40 terms Donnalee_VPLUS Intro to Astronomy26 terms emily_mullins ASTR 102 Chapter 6: Telescopes: Portals of Discove…56 terms dane_spencer ASTR Chap 641 terms jennybacon Sets found in the same folderChapter 5: Concepts review22 terms gonzallg ASTR 102 - TEST - MC06 & SA&TF73 terms ron148 ASTR Ch.643 terms meowww1234 Astronomy Ch. 5 Practice Questions43 terms aredhair Other sets by this creatorVCLP298 terms uthompson95 LG Anim. 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What is the significance of this? 15 answers What is adaptive optics purpose?Adaptive optics allows the corrected optical system to observe finer details of much fainter astronomical objects than is otherwise possible from the ground. Adaptive optics requires a fairly bright reference star that is very close to the object under study.
What is adaptive optics quizlet?Adaptive Optics. Primary telescope mirrors that are continuously and automatically adjusted to compensate for the distortion of starlight due to the motion of Earth's atmosphere.
How does adaptive optics work quizlet?Adaptive optics corrects for atmospheric distortion by following the distortion of a bright star, possibly an artificial star created by a laser, and rapidly changing the shape of a mirror using computer-controlled actuators to compensate for the distortion.
What is the purpose of interferometry quizlet?What is the purpose of interferometry? It allows two or more small telescopes to achieve the angular resolution of a much larger telescope.
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What is the purpose of adaptive optics quizlet?
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