Astronomy

1.	Quiz 6 - Q1
	Unlike supernovae, novae can explode more than once, increasing their luminosity by thousands of times. Student Response Value Correct Answer True 100% True Score: 5/5
2.	Quiz 6 - Q2
	A Type I supernova involves the collapsing core of a high mass star. Student Response Value Correct Answer False 100% False Score: 5/5
3.	Quiz 6 - Q3
	The Chandrasekhar mass limit is Student Response Value Correct Answer Feedback 1. .08 solar masses. 2. .4 solar masses.  3. 1.4 solar masses. 100%    4. 3 solar masses. 5. 8 solar masses. Score: 5/5
4.	Quiz 6 - Q4
	For a nova to occur, the system must have already been a Student Response Value Correct Answer Feedback 1. astrometric binary. 2. detached binary.  3. spectroscopic binary. 0% 4. mass-transfer binary.    5. eclipsing binary. Score: 0/5
5.	Quiz 6 - Q5
	An iron core cannot support a star because Student Response Value Correct Answer Feedback 1. iron is the heaviest element, and sinks upon differentiation. 2. iron has poor nuclear binding energy.  3. iron cannot fuse with other nuclei to produce energy. 100%    4. iron supplies too much pressure. 5. iron is in the form of a gas, not a solid, in the center of a star. Score: 5/5
6.	Quiz 6 - Q6
	A massive star can fuse only up to the element silicon in its core. Student Response Value Correct Answer False 100% False Score: 5/5
7.	Quiz 6 - Q7
	A Type I supernova is more similar to a nova than a Type II supernova. Student Response Value Correct Answer True 100% True Score: 5/5
8.	Quiz 6 - Q8
	A surface explosion on a white dwarf, caused by falling matter from the atmosphere of its binary companion, creates what kind of object? Student Response Value Correct Answer Feedback 1. hypernova  2. nova 100%    3. gamma ray burster 4. Type I supernova 5. Type II supernova Score: 5/5
9.	Quiz 6 - Q9
	Most of the energy of the supernova is carried outward via a flood of Student Response Value Correct Answer Feedback 1. gamma rays. 2. helium nuclei. 3. protons.  4. neutrinos. 100%    5. positrons. Score: 5/5
10.	Quiz 6 - Q10
	Stellar nucleosynthesis is responsible for the existence of all elements except hydrogen. Student Response Value Correct Answer False 100% False Score: 5/5
11.	Quiz 6 - Q11
	Match the following: Shows the spectrum with little hydrogen Red giant losing mass to white dwarf companion Can be recurrent an overloaded white dwarf collapse of a supermassive star Type II supernova Type I supernova nova Statement Response Value Correct Match Shows the spectrum with little hydrogen Type I supernova 20.0% Type I supernova Red giant losing mass to white dwarf companion Type II supernova 0.0% nova Can be recurrent nova 20.0% nova an overloaded white dwarf Type I supernova 20.0% Type I supernova collapse of a supermassive star Type II supernova 20.0% Type II supernova Score: 16/20
12.	Quiz 6 - Q12
	In neutronization of the core, a proton and an electron make a neutron and a Student Response Value Correct Answer Feedback 1. positron. 2. muon.  3. neutrino. 100%    4. pion. 5. antineutrino. Score: 5/5
13.	Quiz 6 - Q13
	As a star's evolution approaches the Type II supernova, we find Student Response Value Correct Answer Feedback 1. the heavier the element, the less time it takes to make it. 2. the heavier the element, the higher the temperature to fuse it. 3. helium to carbon fusion takes at least 100 million K to start 4. photodisintegration of iron nuclei begins at 10 billion K to ignite the supernova.  5. all of the above. 100%    Score: 5/5
14.	Quiz 6 - Q14
	Where was supernova 1987a located? Student Response Value Correct Answer Feedback 1. in the Orion nebula, M42  2. in the Large Magallanic cloud 100%    3. in Sagittarius 4. in the cluster M13 5. In M31, the Andromeda galaxy. Score: 5/5
15.	Quiz 6 - Q15
	Which of these is the likely progenitor of a type I supernova? Student Response Value Correct Answer Feedback  1. a mass-transfer binary, with the white dwarf already at 1.3 solar masses 100%    2. a contact binary, with the neutron star at 2.3 solar masses 3. an evolved red giant which is just starting to make silicon in its core 4. an evolved blue supergiant that is about to experience the helium flash 5. a helium-neon white dwarf Score: 5/5
16.	Quiz 6 - Q16
	Which of these events is not possible? Student Response Value Correct Answer Feedback 1. low-mass stars swelling up to produce planetary nebulae 2. red giants exploding as Type II supernovae 3. close binary stars producing recurrent novae explosions  4. white dwarfs and companion stars producing recurrent Type I supernova events 100%    5. a white dwarf being found in the center of a planetary nebula Score: 5/5
17.	Quiz 6 - Q17
	Nearly all the elements found in nature were formed inside stars, except for Student Response Value Correct Answer Feedback 1. carbon and silicon.  2. hydrogen and helium. 100%    3. iron and molybdenum. 4. silver and gold. 5. uranium and radium. Score: 5/5