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1
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- Question 1 (1 point) The key difference between atoms of two
different chemical elements is their number of
a.Electrons b.Protons
c.Neutrons
- Question 2 (1 point) The neutral atom of the most common
form of hydrogen consists of
- a.one proton and one neutron.
- b.one proton.
- c.one proton, one neutron, and one electron.
- d.one proton and one electron.
- e.an isotope and an ion.
- Question 3 (1
point) Two neutral atoms of the same element but of different isotopes
contain the same number of
- a. Electrons, Protons, and Neutrons
- b. Electrons and Protons but not Neutrons
- c. Electrons and Neutrons but not Protons
- d. Neutrons and Protons but not Electrons
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2
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- Question 4 (1 point)
Fusion of very light elements to make heavier ones releases energy, as
does fission of very heavy elements to make lighter ones. The most
"energetically favorable" and stable element from which
neither fission nor fusion can release energy is
a.Hydrogen
- b.Helium
- c.Carbon
- d.Iron
- e.Uranium
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3
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- Question 5 (1 point) In a lava lamp, heat is transported by blobs of hot
wax moving up when they are hot and down when they are cooler. What type
of heat transport is this?
a. Conduction b. Radiation c. Convection d.
No heat is transported.
- Question 6 (1
point) You're the captain of a Bird of Prey during the Klingon Civil
War. You're being pursued by a dishonorable traitor who deserves to die.
Directing your ship to the flare star you skim its surface, dodging
disruptor fire the whole time. Your sensors pick up a building solar
flare, as powerful as anything produced on Earth's sun. If the pursuing
ship's shields can absorb the power of a thousand hydrogen bombs, can it
survive this flare? (This information IS in your textbook! Check out the
two-page spread.)
- a. I'm peaceful and live according to the non-violent principles of
Ghandi!
- b. Yes, I must find another way to destroy my pursuer.
- c. No, he will die like the dog he is! I just hope I can escape it
myself, but if I do not they will write an epic poem about my deeds.
- Question 7 (1
point) Most of the light we see coming from the sun originates in
the
a.chromosphere
b.photosphere c.corona d.sunspots e.magnetic field
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4
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- Question 8 (1
point) If a sunspot has a temperature of 4200 K and the solar surface
has a temperature of 5800 K, how many times brighter is the surface
compared with the sunspot? (Hint: Use the Stefan-Boltzmann law.)
a. It isn't brighter -- it is fainter!
- b.About 1.4 times brighter.
- c.About 3.6 times brighter.
- d.About 5.6 times brighter.
- Sunspot brightness, use E = σT4
- (T1/T2)4 = (5800/4200)4 = 3.6 times brighter
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5
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- Question 9 (1
point) If a star has a parallax of 0.05 seconds of arc, then its
distance is
a. 2 parsecs
- b.5 parsecs
- c.20 parsecs
- d.50 parsecs
- e.500 parsecs
- Use d=1/p, where units are arcseconds and parsecs, so d= 1/0.05 = 20
parsecs.
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6
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- Question 10 (1
point) In Star Wars, Han Solo claims the Millenium Falcon can make the
Kessel Run in less than 12 parsecs. Huh? That's a distance, not a time!
Star Wars fans claim this line doesn't refer to a trip in the
conventional way, but rather a specific smuggling task. You should now
know where the term parsec comes from. What is the parallax of a star 12
parsecs from Earth?
a.12 arcseconds.
- b.6 arcseconds.
- c.1/6 arcseconds.
- d.1/12 arcseconds.
- e.I don't know what parallax means!
- This is just the reverse of the previous problem. If d=1/p, then p=1/d, right?
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7
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- Q11. Sirius has an apparent magnitude
of about -1.5 and an absolute magnitude of 1.4. Would you have to wait
more than or less than 30 years for a radio signal to arrive from
Sirius?
a. Less than 30 years.
b. More than 30 years.
- 30 years matches light travel time for about 10 parsecs or 30 light
years. If it were at 10 pc,
then M would equal m. If
farther away than 30 light years would need to have an absolute
magnitude greater than the apparent magnitude, which it does.
- Question 12 (1
point) Hadar, at a distance of about 145 parsecs, has an absolute
magnitude of -5.2. Which of the following is most likely Hadar's
apparent magnitude?
a.-8.8
- b.-3.9
- c.0.6
- d.85.9
- m – M = -5 +5 log d = -5 + 5log 145 = -5 + 5(2.16)
- m = -5.2 +5.8 = 0.6
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Notes
