Astronomy 6 Exam Questions Correctly Answered.
Suppose the angular separation of two stars is smaller than the angular resolution of your eyes. How will the stars appear to your eyes? - CORRECT ANSWER The two stars will look like a single point of light
What is a principal advantage of CCDs o...
Astronomy 6 Exam Questions Correctly
Answered.
Suppose the angular separation of two stars is smaller than the angular resolution of your eyes. How will
the stars appear to your eyes? - CORRECT ANSWER The two stars will look like a single point of light
What is a principal advantage of CCDs over photographic film? - CORRECT ANSWER CCDs capture a
much higher percentage of the incoming photons than does film
Order the following in order of increasing efficiency of detecting photons of visible light - CORRECT
ANSWER eye, photographic film, CCD
what best describes the two principal advantages of telescopes over eyes? - CORRECT ANSWER
Telescopes can collect far more light with far better angular resolution
Currently, the largest optical telescope mirrors have a diameter of - CORRECT ANSWER 10 m
What do we mean by the diffraction limit of a telescope? - CORRECT ANSWER It is the best angular
resolution the telescope could achieve with perfect optical quality and in the absence of atmospheric
distortion
What could not be measured by an observation that uses only imaging? - CORRECT ANSWER the rate at
which a variable star brightens and dims
What could not be determined by an observation that uses only spectroscopy? - CORRECT ANSWER the
size of a distant galaxy
What is meant by spectral resolution - CORRECT ANSWER It is a measure of how close two spectral lines
can be distinguished
What studies is best suited to a time monitoring experiment? - CORRECT ANSWER studying whether a
particular star's brightness is steady or variable
, What is always true about images captured with X-ray telescopes? - CORRECT ANSWER They are always
displayed in false color.
What do astronomers mean by light pollution? - CORRECT ANSWER Light pollution refers to light used
for human activities that brightens the sky and hinders astronomical observations
What causes stars to twinkle? - CORRECT ANSWER bending of light rays by turbulent layers in the
atmosphere
What is the purpose of adaptive optics? - CORRECT ANSWER to eliminate the distorting effects of
atmospheric turbulence for telescopes on the ground
What is an artificial star? - CORRECT ANSWER a point of light in Earth's atmosphere created by a laser for
the purpose of monitoring atmospheric fluctuations
What is not a good reason to place observatories on remote mountain tops? - CORRECT ANSWER to be
able to observe at radio wavelengths
Why do astronomers need different telescope designs to observe across the electromagnetic spectrum?
- CORRECT ANSWER Photons of different energy behave differently and require different collection
strategies
What is not an advantage of the Hubble Space Telescope over ground-based telescopes? - CORRECT
ANSWER It is closer to the stars.
What wavelength regions cannot be studied with telescopes on the ground? - CORRECT ANSWER
Ultraviolet and X rays
Telescopes operating at this wavelength must be cooled to observe faint astronomical objects. -
CORRECT ANSWER extreme infrared
At which wavelength range is there no current or planned space observatory? - CORRECT ANSWER radio
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