Lesson 6 PHYS284 practiceexam PDF

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Lesson 6 - practice exam Which of the following is not an advantage of spacecraft flybys over ground-based telescope observations? Not spacecraft can sample the gravitational field of a planet Not spacecraft can measure local magnetic field Telescope operating at this wavelength must be cooled to observe faint astronomical objects Answer: Extreme infrared What do we mean by the diffraction limit of a telescope? Answer: it is the best angular resolution the telescope could achieve with perfect optical quality and in the absence of atmospheric distortion What do astronomers mean by light pollution? Answer: light pollution refers to light used for human activities that brightens the sky and hinders astronomical observations Which of the following is a principal advantage of CCDs over photographic film? Answer: CCDs capture a much higher percentage of the incoming photons than does film Which of the following is always true about images captured with an x-ray telescope? Not useful for seeing through things In what wavelength range was interferometry first routinely used? Not ultraviolet Why was it advantageous for the voyager mission to consist of flybys rather than orbiters? Not flyby spacecraft can get closer to a planet than an orbiting spacecraft The Hubble space telescope is classified as: Not flyby Which of the following is not a good reason to place observatories on remote mountain tops? Not to reduce light pollution Not to be able to observe at infrared wavelengths What does angular measure? Not The angular size of the smallest features that the telescope can see

Which of the following could not be determined by an observation that uses only spectroscopy? Not the speed at which a distant galaxy is moving away from us The angular resolution of a telescope is never less than its diffraction limit Answer: True Which of the following studies is best suited to a time monitoring experiment? Answer: studying whether a particular star’s brightness is steady or variable What is the purpose of adaptive optics? Answer: to eliminate the distorting effects of atmospheric turbulence for telescopes on the ground Which of the following is always true about images captured with X-ray telescopes? Answer: the are always shown with colours that are not the true colours of the objects that were photographed Which spacecraft visited all four giant planets between 1979 and 1989? Answer: Voyager 2 How does the light-collecting area of an 8-metre telescope compare to that of a 1meters telescope? Answer: the 8-meter telescope has 16 times the light-collecting area of the 2-meter telescope A larger telescope will always have a higher spectral resolution than a smaller telescope when observing at the same wavelength Answer: 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 Answer: False...