PHY 150 Exam 2 (final) with correct |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
answers
What are glitches - correct answer✔✔abrupt changes in the pulsation period of a pulsar
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How did Shapley deduce the Milky Way's size and the sun's position in it? - correct
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answer✔✔He determined the distance to the globular clusters in the milky way using period |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
luminosity relationship of cepheid variables |||\\\ |||\\\ |||\\\ |||\\\
What is the difference between open clusters and globular clusters in terms of location? -
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correct answer✔✔open clusters are in the disk of our galaxy while globular clusters are in the
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halo of our galaxy |||\\\ |||\\\ |||\\\
What is the difference between open clusters and globular clusters in terms of age and amount
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of stars? - correct answer✔✔open clusters are generally young and contain a few hundred
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stars while globular clusters are old (11-13 billion years) hundreds of thousands to millions os
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stars (population II stars). |||\\\ |||\\\ |||\\\
between open and globular which type of cluster is still forming today - correct
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answer✔✔open clusters |||\\\
How do we know our galaxy is a flat disk? - correct answer✔✔When we look in the sky, we
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
see a band of stars we call the Milky Way. If our galaxy was spherical, we would see stars
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
scattered uniformly all around us. |||\\\ |||\\\ |||\\\ |||\\\
What happened during the recombination era? - correct answer✔✔This is when electrons
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combine with protons in the early universe. When this happened the universe became
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transparent.
, Why is this important today? - correct answer✔✔Before this time the universe was opaque so
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we can't see the universe before this time.
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What us the cosmic microwave background? What is its origin? - correct answer✔✔Radiation
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
from the young universe that began traveling through space after hot gas from the big bang
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
expanded and cooled enough to become transparent. |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
why do astronomers think that the universe is expanding? - correct answer✔✔all the distant
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
galaxies appear to be moving away from us and the farther away they are, they faster they are
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
moving.
What problems of the big bang theory are resolved by inflationary models? - correct
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answer✔✔the flatness problem and the horizon problem |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
what intersteller medium component absorbs or scatters light whose wavelength is shorter
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than the typical size of its particles? - correct answer✔✔dust
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What is the primary constituent of large complexes called giant Molecular cloud? - correct
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answer✔✔H2
What is seen at radio wavelengths of ground state electrons flipping their spin over to be anti-
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
parallel to the nuclear spin? - correct answer✔✔H I (neutral hydrogen)
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What makes up hot ionized hydrogen regions? - correct answer✔✔HII (ionized hydrogen)
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In what stage do stars spend most of their life? - correct answer✔✔main sequence
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answers
What are glitches - correct answer✔✔abrupt changes in the pulsation period of a pulsar
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
How did Shapley deduce the Milky Way's size and the sun's position in it? - correct
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
answer✔✔He determined the distance to the globular clusters in the milky way using period |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
luminosity relationship of cepheid variables |||\\\ |||\\\ |||\\\ |||\\\
What is the difference between open clusters and globular clusters in terms of location? -
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
correct answer✔✔open clusters are in the disk of our galaxy while globular clusters are in the
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
halo of our galaxy |||\\\ |||\\\ |||\\\
What is the difference between open clusters and globular clusters in terms of age and amount
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
of stars? - correct answer✔✔open clusters are generally young and contain a few hundred
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
stars while globular clusters are old (11-13 billion years) hundreds of thousands to millions os
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
stars (population II stars). |||\\\ |||\\\ |||\\\
between open and globular which type of cluster is still forming today - correct
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
answer✔✔open clusters |||\\\
How do we know our galaxy is a flat disk? - correct answer✔✔When we look in the sky, we
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
see a band of stars we call the Milky Way. If our galaxy was spherical, we would see stars
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
scattered uniformly all around us. |||\\\ |||\\\ |||\\\ |||\\\
What happened during the recombination era? - correct answer✔✔This is when electrons
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
combine with protons in the early universe. When this happened the universe became
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
transparent.
, Why is this important today? - correct answer✔✔Before this time the universe was opaque so
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
we can't see the universe before this time.
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
What us the cosmic microwave background? What is its origin? - correct answer✔✔Radiation
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
from the young universe that began traveling through space after hot gas from the big bang
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
expanded and cooled enough to become transparent. |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
why do astronomers think that the universe is expanding? - correct answer✔✔all the distant
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
galaxies appear to be moving away from us and the farther away they are, they faster they are
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
moving.
What problems of the big bang theory are resolved by inflationary models? - correct
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
answer✔✔the flatness problem and the horizon problem |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
what intersteller medium component absorbs or scatters light whose wavelength is shorter
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
than the typical size of its particles? - correct answer✔✔dust
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
What is the primary constituent of large complexes called giant Molecular cloud? - correct
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
answer✔✔H2
What is seen at radio wavelengths of ground state electrons flipping their spin over to be anti-
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
parallel to the nuclear spin? - correct answer✔✔H I (neutral hydrogen)
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
What makes up hot ionized hydrogen regions? - correct answer✔✔HII (ionized hydrogen)
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
In what stage do stars spend most of their life? - correct answer✔✔main sequence
|||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\ |||\\\
