Astronomy 101 Review For Final Exam

34 Questions | Total Attempts: 233

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Astronomy 101 Review For Final Exam

300 Question Review for Final Exam in Astronomy 101 class at TAMU for Shelby


Questions and Answers
  • 1. 
    Scientific notation is used in science because
    • A. 

      It makes conversions between units easy.

    • B. 

      All astronomical distances are expressed in metric units.

    • C. 

      It makes it easy to write big or small numbers.

    • D. 

      All of the above

  • 2. 
    The average distance from Earth to the sun is...
    • A. 

      1 million km

    • B. 

      1 million miles

    • C. 

      1 light year

    • D. 

      1 AU

    • E. 

      1 billion km

  • 3. 
    The sun is...
    • A. 

      A star

    • B. 

      1 AU from Earth

    • C. 

      More than 100 times the diameter of Earth

    • D. 

      All of the above

  • 4. 
    A galaxy contains...
    • A. 

      Primarily planets.

    • B. 

      Lots of gas and dust but very few stars.

    • C. 

      Gas, dust, and stars, and a lot of dark matter.

    • D. 

      A single star and planets.

    • E. 

      Thousands of superclusters.

  • 5. 
    2.9x10^7 is the same as...
    • A. 

      2.9 thousand

    • B. 

      29 thousand

    • C. 

      290 thousand

    • D. 

      2.9 million

    • E. 

      29 million

  • 6. 
    Newton concluded that some force had to act on the moon because...
    • A. 

      A force is needed to keep the moon in motion.

    • B. 

      The moon moved at a constant velocity

    • C. 

      A force is needed to pull the moon outward

    • D. 

      A force is needed to pull the moon away from straight-line motion

    • E. 

      All of the above

  • 7. 
    Kepler's second law implies that...
    • A. 

      The deferent and the epicycle have to be attached to the sun and not the Earth.

    • B. 

      The speed of a planet in its orbit depends on the size of the epicycle.

    • C. 

      The mass of the planet determines how far the planet is from the sun.

    • D. 

      A planet should move at its greatest speed when it is closest to the sun.

    • E. 

      The most massive planets will have the greatest speed in their orbits.

  • 8. 
    • A. 

      A planet moves at a constant speed at all points in its orbit.

    • B. 

      Uniform circular motion is adequate to describe the motion of all planets.

    • C. 

      The distance between the planet and the sun changes as the planet orbits the sun.

    • D. 

      The distance that a planet is from the sun depends on the mass of the planet.

    • E. 

      Planets closer to the sun than Earth will show retrograde motion

  • 9. 
    • A. 

      Will decrease as the square of the distance between the two masses increases.

    • B. 

      Will increase as the distance between the two masses increases.

    • C. 

      Will cause the two masses to orbit each other

    • D. 

      Will cause the two masses to move in a straight line.

    • E. 

      Will cause the two masses to move away from each other.

  • 10. 
    An object has been located orbiting the sun at a distance from the sun of 65 AU, what is the approximate orbital period of this object?
    • A. 

      65 years

    • B. 

      275,000 years

    • C. 

      4,225 years

    • D. 

      8.1 years

    • E. 

      524 years

  • 11. 
    Saturn is on average 10 AU from the sun.  What is the approximate orbital period of Saturn?
    • A. 

      10 years

    • B. 

      32 years

    • C. 

      100 years

    • D. 

      1000 years

    • E. 

      1,000,000 years

  • 12. 
    • A. 

      The planets traveled in elliptical orbits about the Earth.

    • B. 

      The center of the universe was the Sun with the Milky Way representing other distant planets.

    • C. 

      The Earth was at the center of the universe.

    • D. 

      The Sun was at the center of the universe.

  • 13. 
    When Mars is located directly behind the Earth with respect to the Sun in its orbit, it is...
    • A. 

      Not visible in the night sky.

    • B. 

      At the midpoint in the sky between east and west at sunrise.

    • C. 

      At the midpoint in the sky between east and west at sunset.

    • D. 

      At the midpoint in the sky between east and west at midnight.

    • E. 

      At the midpoint in the sky between east and west at noon.

  • 14. 
    The greatest inaccuracy in Copernicus' model of the solar system was that the planets...
    • A. 

      Travel in circular orbits with uniform motion

    • B. 

      Were allowed to travel backwards in their orbits.

    • C. 

      The planets orbited the Sun.

    • D. 

      Traveled in elliptical orbits.

    • E. 

      Traveled on epicycles whose centers followed orbits around the Sun

  • 15. 
    Which of the following statements best describes Kelper's 3rd law of planetary motion?
    • A. 

      The smaller the orbit, the longer its orbital period

    • B. 

      The larger the orbit, the longer its orbital period.

    • C. 

      The smaller the diameter of a planet, the faster its rotational period

    • D. 

      The orbital period of a planet is directly proportional to the diameter of the planet

  • 16. 
    The energy of a photon...
    • A. 

      Depends only on the speed of light

    • B. 

      Depends only on the mass of the photon

    • C. 

      Depends on both the mass and speed of the photon

    • D. 

      Is proportional to the wavelength of the light.

    • E. 

      Is inversely proportional to the wavelength of the light.

  • 17. 
    • A. 

      Will have a greater energy than short wavelength visible light

    • B. 

      Will have a speed that is faster than short wavelength light.

    • C. 

      Will appear blue in color to the average human eye

    • D. 

      Will appear red in color to the average human eye

    • E. 

      Has a higher frequency than short wavelength visible light

  • 18. 
    Photons of blue light...
    • A. 

      Have a greater energy than photons of red light

    • B. 

      Have a greater energy than photons of ultraviolet light

    • C. 

      Have a longer wavelength than photons of red light

    • D. 

      Have a lower frequency than photons of red light

    • E. 

      Travel at a greater speed than photons of red light

  • 19. 
    A nanometer is...
    • A. 

      A unit of frequency

    • B. 

      A unit of energy

    • C. 

      A unit of mass

    • D. 

      A unit of resolving power

    • E. 

      A unit of length

  • 20. 
    In which way does a photon of blue light NOT differ from a photon of red light?
    • A. 

      Speed

    • B. 

      Wavelength

    • C. 

      Color

    • D. 

      Energy

    • E. 

      Frequency

  • 21. 
    What is the relationship between color and wavelength for light?
    • A. 

      Wavelength decreases from blue light to red light

    • B. 

      Wavelength increases from blue light to red light

    • C. 

      All colors of light have the same wavelength

    • D. 

      Wavelength depends on intensity not color

  • 22. 
    The neutral hydrogen atom consists of...
    • A. 

      One proton and one neutron

    • B. 

      One proton and one electron

    • C. 

      One proton, one neutron, and one electron

    • D. 

      One proton

    • E. 

      An isotope and an ion

  • 23. 
    Which of the following statements is correct?
    • A. 

      There are about 10^11 stars in the Milky Way Galaxy, but there are ten times more stars that are made of dark matter

    • B. 

      There are about 10^11 stars in the Milky Way Galaxy, but the mass of the Milky Way is about 10^12 times that of the Sun

    • C. 

      There are about 10^13 stars in the Milky Way Galaxy, but the mass of the Milky Way is about 10^14 times that of the Sun

    • D. 

      There are about 10^10 stars in the Milky Way Galaxy, but the mass of the Milky Way is about 10^12 times that of the Sun

  • 24. 
    The period of the Milky Way to circle the Sun is about...
    • A. 

      125 million years

    • B. 

      125 billion years

    • C. 

      450 million years

    • D. 

      225 million years

  • 25. 
    A galaxy is found to be at a redshift 9,100 km/sec.  Assuming a Hubble constant of 70 km/sec/Mpc, the distance to the galaxy is found to be...
    • A. 

      130 Mpc

    • B. 

      637 Mpc

    • C. 

      30.3 Mpc

    • D. 

      130 Kpc

  • 26. 
    Why are fossils of early life on Earth more rare than fossils of plants and animals from the past few hundred million years? 
    • A. 

      We find fossils in sedimentary layers, and no sediments were deposited until just a few hundred million years ago.

    • B. 

      Life was far less abundant prior to a few hundred million years ago

    • C. 

      Fossils could not form before there was oxygen in the atmosphere

    • D. 

      Early organisms lacked skeletons and other hard structures that are most likely to be fossilized

  • 27. 
    How do we determine the conditions that existed in the very early universe?
    • A. 

      From the current expansion rate we can work backward to estimate temperature and densities at various times in the early universe.

    • B. 

      By looking all the way to the cosmological horizon, we can see the actual conditions that prevailed all the way back to the first instant of the Big Bang

    • C. 

      The conditions in the very early universe must have been much like those found in stars today, so we learn about them by studying stars

    • D. 

      We can only guess at the conditions, since we have no way to calculate or observe what they were.

  • 28. 
    When we say that the electroweak and strong forces "freeze out" at 10^-35 seconds after the Big Bang, we mean that...
    • A. 

      "freezing out" was a term coined by particle physicists who think that the Big Bang theory is the ultimate theory for the Universe

    • B. 

      These forces are important only at temperatures below the freezing point of water --- a temperature that the universe reached at an age of about 10^-35 seconds.

    • C. 

      Prior to this time, the electroweak and strong forces were indistinguishable from each other, but after this time they behaved differently from each other

    • D. 

      Following this time, neither the strong nor electroweak forces are ever important in the universe again

  • 29. 
    According to the Big Bang theory, how many forces --- and which ones --- operated in the universe during the GUT era?
    • A. 

      3: gravity, the strong force, and the electroweak force

    • B. 

      1 force that represented the unification of all four forces that operate today

    • C. 

      2: the strong force and the electroweak force

    • D. 

      2: gravity and a single force that later became the strong, weak, and electromagnetic forces

  • 30. 
    The Milky Way Galaxy...
    • A. 

      Contains about 100 billion stars.

    • B. 

      Is the largest known object in the universe.

    • C. 

      Is about 200 light-years in diameter.

  • 31. 
    The force due to gravity between two objects depends on...
    • A. 

      The mass of each object

    • B. 

      The distance each object is from Earth.

    • C. 

      The distance between two objects.

    • D. 

      The speed of light.

  • 32. 
    _____________ has/have wavelengths that are longer than visible light.
    • A. 

      Gamma-rays

    • B. 

      Ultraviolet light

    • C. 

      Infrared radiation

    • D. 

      X-rays

  • 33. 
    ________________ has/have wavelengths that are shorter than visible light.
    • A. 

      Gamma-rays

    • B. 

      Ultraviolet light

    • C. 

      Infrared radiation

    • D. 

      X-rays