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Astronomy Final > Exam #3 > Flashcards

Exam #3 Flashcards

1
Q

What is the symbol for a neutrino?

A

V

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2
Q

Which is not a property of a neutrino?

A

Low velocity

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3
Q

Why do neutrino detectors conduct their neutrino experiments at night?

A

The Earth is used as a filter against any other particles emitted by the Sun

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4
Q 
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
A

6.6Mo star

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5
Q 
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
A

G1

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6
Q

What color would a G3 spectral type star be?

A

Yellow-ish

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7
Q

Which statement is correct about each successive fusion in the cores of supergiant stars?

A

Each successive fusion requires a higher temperature and does not last as long as the previous fusion

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8
Q

If a 4.0Mo giant star eventually becomes a white dwarf, what would be a good estimate of the mass of that white dwarf?

A

1Mo

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9
Q 
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
A

B. 14.3 Mo

Large stars burn more fuel and die faster

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10
Q

What keeps gravity from collapsing a main sequence star?

A

Gas pressure

Radiation pressure

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11
Q

Which of the following is not correct about a type II supernovae?

A

Happens every year in a particular Galaxy

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12
Q

The Chandrasekhar limit is?

A

1.4Mo

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13
Q

The most energetic supernovae are referred to as ?

A

Hypernovae

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14
Q

Jocelyn Bell, at Cambridge University, discovered a type of object called a ?

A

Pulsar

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15
Q

According to present theory, a white dwarf will eventually become a ?

A

Black dwarf

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16
Q

Iron fusion leads to a supernova because iron fusion?

A

Absorbs energy

17
Q

If a stellar cores mass is calculated to be 2.3 Mo what force would be keeping gravity from collapsing it?

A

Neutron pressure

18
Q

According to present calculations, the sun has _______ years left to go on the main sequence.

A

5-7 billion years

19
Q

If and when the Sun becomes a giant star, what would be a good estimate for its spectral type when it is a giant?

A

K2

20
Q

The “LGM” in the LGM sources stood for?

A

Little Green Men

21
Q

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!

A

300 thousand times more than your weight on Earth

22
Q

The owl nebula and ring nebula are examples of ?

A

Planetary nebulae

23
Q

The Dogon tribe in Africa was very concerned with the star?

A

Sirius

24
Q

In the equation E=MC2, the variables stand for ___________.

A

Energy, Mass, Speed of Light

25
Q

What keeps gravity from collapsing Sirius B?

A

Electron pressure

Astronomy Final (4 decks)

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