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Astronomy 2 exam 2
Terms in this set (30)
Compared with a complex atom like neon, a simple atom such as hydrogen has
Fewer excited states
Compared with cooler stars, the hottest stars have absorption lines that are
broad and fuzzy
Only a hot, thin gas can produce an emission line.
A low density gas must be hot in order to produce an absorption line.
What is spectroscopy?
an analysis of the way in which atoms absorb and emit light
The particle which adds mass but no charge to the atomic nucleus is the:
The three laws dealing with the creation of various spectra are due to:
What does a blueshifted spectrum indicate?
The source is moving toward you.
The larger the red shift, the faster the distant galaxy is rushing toward us.
Spectroscopy of a star can reveal its temperature, composition, and line-of-sight motion.
Compared with radio telescopes, optical telescopes can
resolve finer detail
The Spitzer Space Telescope (SST) is stationed far from Earth because
Earth is a heat source and the telescope must be kept very cool.
What is the primary purpose of an astronomical telescope?
To collect a lot of light and bring it to a focus.
Which type of telescope has the simplest light path?
prime focus reflector
Which design has a convex primary mirror and flat secondary mirror, with the eyepiece located on the top side of the telescope tube?
Diffraction is the tendency of light to:
spread around corners
What type of telescope is the Hubble Space Telescope?
Radio dishes are large in order to:
increase their angular resolution and collect the very weak radio photons.
It is much easier to build large reflectors than large refractors.
The primary purpose of a telescope is to
collect a large amount of light and bring it into focus.
Compared to a 5 inch prime focus reflector, a 5 inch Newtonian reflector will
have the same light gathering power
What is "seeing"?
a measurement of the image quality due to air stability
Listed following are the different layers of the Sun. Rank these layers based on their distance from the Sun's center, from greatest to least.
Greatest distance corona, chromosphere, photosphere, convection zone, radiation zone, core. least distance.
The time between successive sunspot maxima is about
Compared with Earth's diameter, the Sun's diameter is about
100 times larger
The light we see from the Sun comes from which layer?
From where does most of the solar wind flow?
The primary source of the Sun's energy is
the strong force fusing hydrogen into helium
Sunspots appear dark because they are hotter than the surrounding gas of the photosphere.
Compared to a main-sequence star with a short lifetime, a main-sequence star with a long lifetime is __________.
less luminous, cooler, smaller, and less massive
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