Exam #3 Flashcards
What is the symbol for a neutrino?
V
Which is not a property of a neutrino?
Low velocity
Why do neutrino detectors conduct their neutrino experiments at night?
The Earth is used as a filter against any other particles emitted by the Sun
Which main sequence star, would be least common in the universe? A. 1.4Mo B. 5.3 Mo C. 2.8 Mo D. 3.2 Mo E. 6.6 Mo
6.6Mo star
Which spectral type main sequence star would have a total lifetime of slightly shorter than the Sun's total lifetime? • B1 • G3 • G4 • G1 • O3
G1
What color would a G3 spectral type star be?
Yellow-ish
Which statement is correct about each successive fusion in the cores of supergiant stars?
Each successive fusion requires a higher temperature and does not last as long as the previous fusion
If a 4.0Mo giant star eventually becomes a white dwarf, what would be a good estimate of the mass of that white dwarf?
1Mo
Which star listed below would have the shortest total lifetime on the main sequence? A. 1.5 Mo B. 14.3 Mo C. 0.8 Mo D. 10.0 Mo E. 0.3 Mo
B. 14.3 Mo
Large stars burn more fuel and die faster
What keeps gravity from collapsing a main sequence star?
Gas pressure
Radiation pressure
Which of the following is not correct about a type II supernovae?
Happens every year in a particular Galaxy
The Chandrasekhar limit is?
1.4Mo
The most energetic supernovae are referred to as ?
Hypernovae
Jocelyn Bell, at Cambridge University, discovered a type of object called a ?
Pulsar
According to present theory, a white dwarf will eventually become a ?
Black dwarf
Iron fusion leads to a supernova because iron fusion?
Absorbs energy
If a stellar cores mass is calculated to be 2.3 Mo what force would be keeping gravity from collapsing it?
Neutron pressure
According to present calculations, the sun has _______ years left to go on the main sequence.
5-7 billion years
If and when the Sun becomes a giant star, what would be a good estimate for its spectral type when it is a giant?
K2
The “LGM” in the LGM sources stood for?
Little Green Men
If a typical white dwarf star is 300 thousand times the mass of the Earth, yet is approximately the same radius as the Earth, what would you weigh on the surface of a white dwarf as opposed to your weight on Earth!
300 thousand times more than your weight on Earth
The owl nebula and ring nebula are examples of ?
Planetary nebulae
The Dogon tribe in Africa was very concerned with the star?
Sirius
In the equation E=MC2, the variables stand for ___________.
Energy, Mass, Speed of Light
What keeps gravity from collapsing Sirius B?
Electron pressure
