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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.
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