Your legible name __________________________________
Astro 203, Spring 2002, Olszewski/Bailin
Quiz 3 and Quiz 2 retake, Feb 22

Each question has one best answer. Mark that best answer on the SCANTRON.
Ensure that your name is on the SCANTRON.

Quiz 3

1) Kepler showed that
  a) some planets move fastest when they're furthest from the Sun.
  b) the speed of a planet is fixed at planet formation and remains the same
     forever.
  c) no planets follow elliptical orbits.
  d) each planet obeys a different set of laws (there is no regularity to
     the solar system).
  e) all planets move fastest when closest to the sun in their orbits.

2) Galileo's first telescopic observations revealed that Venus
  a) has a full cycle of phases.
  b) is always a crescent.
  c) orbits the Moon.
  d) is always on the far side of the Sun.
  e) is always full.

3) Suppose you're an astronaut taking a space walk to fix your spacecraft
    with a hammer. Unfortunately, your life-line breaks, and the jets on
    your backpack are out of fuel! How could you return to your spacecraft?
  a) turn on your helmet propeller and fly back.
  b) fling your arms around in circles.
  c) roll your body into as small a ball as possible.
  d) throw your hammer as hard as you can directly away from the spacecraft.
  e) there is no return. you will die...

4) If you hold a ball up to a height of 6 feet above the Earth, and let it
    go, it takes 0.6 seconds to fall to the Earth. Now imagine a baseball
    pitcher throwing a ball 100 miles per hour (146 feet per second). Further
    imagine that he throws it EXACTLY level to the ground from a height of 
    exactly 6 feet. How long does it take this ball to hit the ground?
    a) cannot be determined from the information given
    b) 0.6 seconds x 100 = 60 seconds
    c) 0.6 seconds
    d) 0.6 seconds x P-cubed
    e) 0.6 seconds divided by 100 = .006 seconds

5) According to the Law of Inertia, if a person were moving forward
   at 60 miles per hour (say, in a car), in order to stop moving, a force would
   have to be applied to that person. Assuming the person is not wearing
   a seat belt, what force will slow this person down as the brakes are 
   jammed on?
    a) The brakes applied the needed force to stop the person 
       (as opposed to the car).
    b) The seat applied the needed force.
    c) The windshield applied the needed force.
    d) Friction provided the needed force.


6) If the Sun were the size of a grapefruit, the nearest star would be
    xxx miles away.
    a) xxx = 1/10th
    b) xxx = 1
    c) xxx=10
    d) xxx=100
    e) xxx is greater than 1000.


7) Two stars have the same absolute magnitudes but different apparent 
    magnitudes. How do we reconcile these two facts?
    a) you can't, someone screwed up.
    b) the two stars have different luminosities.
    c) the two stars are at different distances.
    d) the two stars have different temperatures.
    e) the two stars have different sizes.

8) If you went to a ``star store'' and bought 100 stars chosen at random,
    what would you get?
    a) stars of all luminosities
    b) mostly stars that have lower luminosities than the Sun.
    c) mostly stars that have higher luminosities than the Sun.
    d) mostly stars of spectral type O.
    
9) Star A is 10 times farther away from the Sun than star B. Its parallax is
    a) 10 times larger than that of star B.
    b) 10 times smaller than that of star B.
    c) 10x10 (10 squared) times larger than that of star B.
    d) 10 squared times smaller than that of star B.
    e) the same as that of star B. The Earth's orbit is the same size for
       both measurements.

10) The ``year 1900 Harvard stellar classification scheme'' was mostly based on
    a) the strength of Hydrogen lines.
    b) the strength of Helium lines.
    c) the quantum mechanical nature of the atoms.
    d) parallax.
    e) proper motion.
    
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QUIZ 2 retake- TURN OVER YOUR SCANTRON AND START WITH QUESTION 51
                TURN OVER YOUR SCANTRON
51) Consider a situtation in which there is a source of continuous radiation
   behind a cloud of cold gas as shown. What sort of spectrum will observer
   1 see?

   a) an absorption line spectrum
   b) a continuous spectrum with 
      emission lines superposed
   c) a continuous spectrum
   d) no light at all
   e) an emission line spectrum

52) What sort of spectrum will observer 2 see 
   (observer 2 cannot see the source of 
    continuous radiation directly)?
   a) an absorption line spectrum
   b) a continuous spectrum with 
      emission lines superposed
   c) a continuous spectrum
   d) no light at all
   e) an emission line spectrum

53) As a solid body gets hotter, it emits electromagnetic radiation
   a) that is fainter and whose spectrum peaks at shorter wavelengths
   b) that is brighter and whose spectrum peaks at shorter wavelengths
   c) that is brighter and whose spectrum peaks at longer wavelengths
   d) that is fainter and whose spectrum peaks at longer wavelengths







54) For an electron to move from one energy level to a higher one it
    must _____. It usually gets this energy from _______.
    a) emit energy; the photoelectric effect
    b) absorb energy; radioactivity
    c) emit a photon; having previously absorbed light
    d) absorb energy; collisions or by absorbing light

55) The equation for the Doppler Effect is   

   If the H-alpha line of Hydrogen is at 6563 Angstroms ``at rest'', and
   if the star is moving away from us at 300 km/s (the speed of light, c, 
   is 300,000 km/s), what wavelength do we see for that star's
   H-alpha line?
    a) 6570 Angstroms.
    b) 6556 Angstroms.
    c) 6863 Angstroms.
    d) 6263 Angstroms.
    e) much greater than 6770 Angstroms.

56) According to Wien's Law, the wavelength at which a solid iron ball
   (or a dense gas) emits the most light is given by


   The Sun is a 5800 degrees K object, and emits most of its light
   at 5000 Angstroms, in the yellow part of the spectrum.
   A 23,200 degree star (4 times as hot) emits most of its light at?
    a) 20,000 Angstroms, in the infrared.
    b) 1250 Angstroms, in the ultraviolet.
    c) 20,000 Angstroms, in the ultraviolet.
    d) 1250 Angstroms, in the infrared.

57) According to the inverse-square law of light, if two otherwise identical
   stars differ by a factor of 100 in apparent brightness, then
   a) the fainter star is 100x100 times as far away.
   b) the fainter star is 100x100 times closer.
   c) the fainter star is 10 times farther away.
   d) the fainter star is 10 times closer.

58) How can you make an electron move from the lowest energy state to
   a higher energy orbit?
   a) you can ONLY do it by absorbing a photon of just the right energy.
   b) you can ONLY do it by having a collision between two atoms of
      just the right energy.
   c) you can ONLY do it by changing the number of protons in the nucleus.
   d) you do it by hitting the atom with just the right amount of energy
      for the electron to change states.
   e) you do it by the electron emitting a photon.

59) The Ptolemaic model of the solar system
   a) has the Sun at the center.
   b) has the Moon at the center.
   c) has Jupiter at the center.
   d) has the Earth at the center.

60) Which of the following names is an example of a BAYER NAME of a star?
   a) Sirius
   b) Alpha Ori
   c) 67 Peg
   d) SAO 1234
   e) IRAS B1200+567