Named pulsars which emit high energy x-ray radiation from their poles because of their magnetic field.
Whose varying distance from earth causes variations in apparent magnitude
Which are unstable and undergoe periodic expansions and contractions, leading to similar variations in apparent brightness
With a known constant absolute magnitude
7. For Cepheid variable stars, the period of their variations in brightness and their luminosity are...?
Inversely proportionally related
Non-linearly related
Linearly related
Proportionally related
8. If the apparent magnitude of a star is a more negative value, that means it is observed on earth as an extremely dim star.
False
True
9. The apparent magnitude scale is a logarithmic scale in which each unit of apparent magnitude is 2.512 (100^(1/5)) times as bright, meaning that 2.512^(m) = b1
True
False
10. The equation relating the apparent magnitude (m) of a star and it's absolute magnitude (M) is...?
M= m + 2.512log (d / 10)
M= m - 2.512log (d / 10)
M= m - 5log (d / 10)
M= m + 5log (d / 10)
11. If Polaris has an apparent magnitude of 1.99 and Betelgeuse 0.41, how much brighter is Betelgeuse than Polaris?
-4.29
4.29
-0.233
0.233
12. Stars with greater absolute magnitudes (M) must also have a greater apparent brightness (b).
False
True
13. The formation of a proto-star involves...?
A core of helium forms from hydrogen fusion, causing a compression of the star due to less thermal pressure. This then causes further fusion of helium which causes the star to expand.
The contraction of a large cloud of gas due to the gravitational attraction of the gas molecules, causing a hot more dense ball to form which gives out light.
The fusion of hydrogen which causes an increase in temperature and outward pressure which balances the inward force of gravity
An increase in the stars mass until the radiation is great enough to blow away the dust cloud and stabilize its mass
14. The formation of a pre-main sequence star from a proto-star involves...?
An increase in the stars mass until the radiation is great enough to blow away the dust cloud and stabilize its mass
A core of helium forms from hydrogen fusion, causing a compression of the star due to less thermal pressure. This then causes further fusion of helium which causes the star to expand.
The contraction of a large cloud of gas due to the gravitational attraction of the gas molecules, causing a hot more dense ball to form which gives out light.
The fusion of hydrogen which causes an increase in temperature and outward pressure which balances the inward force of gravity
15. The formation of a main sequence star from a pre-main sequence star involves...?
The contraction of a large cloud of gas due to the gravitational attraction of the gas molecules, causing a hot more dense ball to form which gives out light.
A core of helium forms from hydrogen fusion, causing a compression of the star due to less thermal pressure. This then causes further fusion of helium which causes the star to expand.
The fusion of hydrogen which causes an increase in temperature and outward pressure which balances the inward force of gravity
An increase in the stars mass until the radiation is great enough to blow away the dust cloud and stabilize its mass
16. The formation of a red giant star from a main sequence star involves...?
The fusion of hydrogen which causes an increase in temperature and outward pressure which balances the inward force of gravity
The formation of a core of helium from hydrogen fusion, causing a compression of the star due to less thermal pressure. This then causes further fusion of helium which causes the star to expand exponentially.
The contraction of a large cloud of gas due to the gravitational attraction of the gas molecules, causing a hot more dense ball to form which gives out light.
An increase in the stars mass until the radiation is great enough to blow away the dust cloud and stabilize its mass
17. The largest nuclei in a star which can theoretically undergo fusion to produce energy during the main sequence is...?
Iron
Hydrogen
Silicon
Helium
18. Small stars do not have the necessary temperatures or pressures to fuse...?
Hydrogen nuclei
Helium nuclei
Carbon nuclei
Iron nuclei
19. The Pauli exclusion principle prevents small cooling stars from contracting past the core of carbon. The Pauli exclusion principle states that...?
Electrons will occupy empty orbitals before joining occupied orbitals
The resulting emergent repulsive force, manifested as a pressure against compression of matter into smaller volumes of space
No two Fermions (particles with half spin) can occupy the same quantum state
Electrons fill atoms orbitals from the lowest energy state to the highest energy state
20. The Pauli exclusion principle means that there is an 'electron degeneracy pressure'. The electron degeneracy pressure means that...?
There is a resulting emergent repulsive force, manifested as a pressure against compression of matter into smaller volumes of space
No two Fermions (particles with half spin) can occupy the same quantum state
Electrons fill atoms orbitals from the lowest energy state to the highest energy state
Electrons will occupy empty orbitals before joining occupied orbitals
