Astronomy Test 2 Questions Lecture 16 1 Two gas clouds oating 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 2 You create two clouds of gas oating 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 low density cloud b the high density cloud c they will have the same self gravity d cannot tell a the cold cloud b the hot cloud d cannot tell c gravity will affect both clouds the same 3 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 mass B Star B has the greatest mass C Star C has the greatest mass D all main sequence stars have about the same mass 4 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 coolest B Star B is the coolest C Star C is the coolest D all main sequence stars the same temperature 5 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 sun B a star with 10 times the mass of the sun will live more than 10 times longer than the sun C a star with 10 times the mass of the sun will live 1 10 as long as the sun D a star with 10 times the mass of the sun will live less than 1 10 as long as the sun 6 Blue main sequence stars are a high mass b intermediate mass c low mass d there s no connection between main sequence color and mass 7 High mass main sequence stars have a very long lives b very short lives c intermediate length lifetimes d there s no connection between mass and lifetime 8 You observe a star cluster that contains blue main sequence stars That cluster is most likely b intermediate age a young c old d cannot tell from the information given Lecture 17 1 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 Hole 4 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 supernova 5 Red giant stars are a are very massive b have a very large radius c both a b d neither a nor b Lecture 18 off a a Type Ia b b Type II c c cannot tell a Yes b No c a Yes b No c I don t Know I don t know Lecture 19 1 What kind of supernova was the Planet Express ship most likely way too close to when it went 2 Light has no mass According to Newton s Law of Gravity does light have gravity 3 According to Newton s Law of Gravity can light be affected by a massive object 1 Stars spend most of their lifetimes in what phase a a white dwarf b b star formation c c main sequence d d red giant supergiant luminosities that it can have a True b False 2 For a main sequence star with a certain mass there is a wide range of temperatures and 3 Which of the following properties of a star can you easily determine when observing it from 4 Star F is known to have m 26 and M 4 0 The distance to Star F is Earth a a color b b absolute magnitude c both a b c d d neither a nor b a much more than 10 pc b b slightly more than 10 pc c d d slightly less than 10 pc e e much less than 10 pc c about 10 pc a 3 6 b b 0 85 c 1 33 c d d 4 7 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 6 In applying the method of spectroscopic parallax it is usually assumed that a main sequence star lies 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 thought b 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 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 Farther than you originally thought closer than you originally thought b at the same distance as originally thought c a a closer than 10 pc b b exactly 10pc c d d cannot tell from the information given c farther away than 10pc 10 a b b 4 c c 0 d d 10 9 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 …