Unformatted text preview:

Astronomy Test 2 QuestionsLecture 161) Two gas clouds floating in space have the same temperature (so the atoms/molecules have the same speed). Both have the same volume, but one cloud is low mass (low density) while the other is very massive (high density). Which one will have more self-gravity? That is, in which cloud will the force of gravity be able to hold it together in spite of the motion of the atoms/molecules?a) the low density cloudb) the high density cloudc) they will have the same self-gravityd) cannot tell2) You create two clouds of gas floating in space. Both have the same mass and start out with the same volume. However, one is very hot while the other is very cold. In which cloud of gas is it more likely that the force of gravity will be able to win out over the motion of the atoms/molecules?a) the cold cloudb) the hot cloudc) gravity will affect both clouds the samed) cannot tell3) Consider the information given below about three main sequence stars:A will be on the main sequence for 45 billion years.B will be on the main sequence for 100 million years.C will be on the main sequence for 2 million years.Which of the following statements is true?A. Star A has the greatest massB. Star B has the greatest massC. Star C has the greatest massD. all main sequence stars have about the same mass4) Consider the information given below about three main sequence stars:A will be on the main sequence for 45 billion years.B will be on the main sequence for 100 million years.C will be on the main sequence for 2 million years.Which of the following statements is true?A. Star A the coolestB. Star B is the coolestC. Star C is the coolestD. all main sequence stars the same temperature5) Which of the following statements is correct?A. a star with 10 times the mass of the sun will live 10 times longer than the sunB. a star with 10 times the mass of the sun will live more than 10 times longer than the sunC. a star with 10 times the mass of the sun will live 1/10 as long as the sunD. a star with 10 times the mass of the sun will live less than 1/10 as long as the sun6) Blue main sequence stars are?a) high massb) intermediate massc) low massd) there’s no connection between main sequence color and mass7) High mass main sequence stars have:a) very long livesb) very short livesc) intermediate length lifetimesd) there’s no connection between mass and lifetime8) You observe a star cluster that contains blue main sequence stars. That cluster is most likely:a) youngb) intermediate agec) oldd) cannot tell from the information givenLecture 171) Our Sun will not become a nova because?a) it is not massive enough. b) it is too massive. c) it does not have a binary companion. d) neutron stars cannot become novae.2) Black Holes are formed by?a) a lack of any light in a region of space. b) supernovae from the most massive stars. c) supernovae from binary stars. d) collapsed dark nebulae.3) Which of the following lists, in the correct order, a possible evolutionary path for a star?a) Red Giant, Neutron Star, White Dwarf, Nothing b) Red Giant, Type II Supernova, Black Hole, Nothing c) Red Giant, Type II Supernova, Planetary Nebula, Neutron Star d) Red Giant, Planetary Nebula, White Dwarf e) Red Giant, Planetary Nebula, Black Hole4) For a white dwarf to become a type II supernova, it is necessary for it to?a) have a binary companion. b) become a black hole. c) have begun life as a high-mass star.d) rejoin the main sequence. e) it cannot become a type II supernova5) Red giant stars are?a) are very massiveb) have a very large radiusc) both a & bd) neither a nor b Lecture 181) What kind of supernova was the Planet Express ship most likely way too close to when it went off?a. a) Type Iab. b) Type IIc. c) cannot tell2) Light has no mass. According to Newton’s Law of Gravity, does light have gravity?a. Yesb. Noc. I don’t Know3) According to Newton’s Law of Gravity, can light be affected by a massive object?a. Yesb. Noc. I don’t knowLecture 191) Stars spend most of their lifetimes in what phase?a. a) white dwarfb. b) star formationc. c) main sequenced. d) red giant/supergiant2) For a main sequence star with a certain mass, there is a wide range of temperatures and luminosities that it can have.a. Trueb. False3) Which of the following properties of a star can you easily determine when observing it from Earth?a. a) colorb. b) absolute magnitudec. c) both a & bd. d) neither a nor b4) Star F is known to have m= -26 and M= 4.0. The distance to Star F is: a. much more than 10 pc. b. b) slightly more than 10 pc. c. c) about 10 pc. d. d) slightly less than 10 pc. e. e) much less than 10 pc.5) Spica is located about 80 parsecs away. Spica’s apparent magnitude is 0.91. Which of the following is most likely Spica’s absolute magnitude? a. –3.6b. b) 0.85 c. c) 1.33 d. d) 4.76) In applying the method of spectroscopic parallax, it is usually assumed that a main sequence starlies along the middle of the main sequence band. If instead, a star were actually along the lower (fainter) edge of the main sequence band (but still at the same temperature), its actual distance would be: a. Closer than you originally thoughtb. farther than you originally thought.7) Using spectroscopic parallax, you find a star’s distance to be 76 parsecs. You now find out that the star isn’t a main sequence star – it’s actually a red giant. This means that the star is located: a. Farther than you originally thoughtb. closer than you originally thought. c. at the same distance as originally thought.8) You observe a star and measure it’s apparent magnitude as m=-4. You also determine that the star is at the tip of the red giant branch. How far away is that star? a. a) closer than 10 pcb. b) exactly 10pcc. c) farther away than 10pcd. d) cannot tell from the information given9) You observe a star cluster whose distance was measured by parallax to be 1000pc. At what apparent magnitude would you expect to find the stars that are on the horizontal branch? a. -10b. b) -4c. c) 0d. d) 10Lecture 201) A satellite orbits close to the Sun and detects a solar flare erupting at 10:00 P.M., as measured by the satellite’s clock. Your clock is exactly synchronized with the satellite clock. The Sun is located 8 light minutes away from Earth. If you wish to observe this flare from your backyard, you need to look at the Sun at:a. a) 9:52 P .M. b. b) 10:00 P .M. c. c) 10:08 P .M.d. d) None of the above are correct,


View Full Document

LSU ASTR 1102 - Lecture 16

Download Lecture 16
Our administrator received your request to download this document. We will send you the file to your email shortly.
Loading Unlocking...
Login

Join to view Lecture 16 and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Lecture 16 2 2 and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?