Flashcards
ch. 6 (test II)
Cards in this deck (23)
- 1how do cameras capture light?charge-coupled devices (CCDs)
- 2what are CCD detectors similar to?the ones in modern telescopes
- 3what is light-collecting area?telescopes w/ a larger collecting area can gather a greater amount of light in a shorter time
- 4angular resolutiontelescopes that are larger are capable of taking images with greater detail
- 5what can a telescope's diameter tell you ?what it's light-collecting area is
- 6what is angular resolutionthe minimum angular separation that the telescope can distinguish between
- 7what causes stars to look like dots and blurry?they are so far away so they look like dots and interference causes them to look blurry
- 8what focuses light with lenses?refracting telescope
- 9what focuses light with mirrorsreflecting telescope
- 10define refractionit is the bending of light when it passes from one substance into another
- 11what do refracting telescopes need?they need to be very long w/ large heavy lenses
- 12what is this picture of?reflection
- 13what is this picture of?refraction
- 14what are the two most important properties of a telescope?-collecting area determines how much light a telescope can gather
- angular resolution is the minimum angular separation a telescope can distinguish - 15what type of telescope are the vast majority of professional telescopesreflectors
- 16why can reflection telescopes have much larger diameters?because they can withstand large temp. changes
- 17what can compensates for some of the effects of turbulence?rapidly changing the shape of a telescope's mirror
- 18—adaptive optics
- 19why do we need telescopes in space to observe other forms of light?because only radio and visible light pass easily through Earth's atmosphere
- 20what essentially is a radio telescopeit is like a giant mirror that reflects radio waves to a focus
- 21what do infrared and ultraviolet light telescopes operate like?visible-light telescopes but from above the atmosphere
- 22what is interferometeryit is a technique for linking two or more telescopes so that they have the angular resolution of a single large one
- 23can interferometry be done with infrared and visible light telescopes?yes but it is easier to do with radio
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- 3321 Astronomy Flashcards on ch. 6 (test II), created by McKey McCrae on 12/10/2015.
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- McKey McCrae · Oct 2015
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- Feb 19, 2016
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