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ASTRO 7N EXAM 3|| LATEST COMPLETE EXAM WITH
QUESTIONS AND ANSWERS|| VERIFIED EXAM!!!
Hertsprung-russel diagram - answer-shows the brightness
of the stars on a scale. Plots the luminosity (y-axis)
against the star's surface temperature (x-axis) *the surface
temperature gets hotter from right to left, so the hotter
stars are bluer and the cooler stars are redder. The closer
that you get to the y axis, the hotter the surface
temperature gets
The spectral class of stars - answer-from hottest to coldest
they are ranked obafgkm
Obafgkm - answer-oh be a fine girl kiss me
We determine the spectral class of a star using the -
answer-absorption spectrum
The vertical axis of the hertsprung-russel diagram -
answer-represents the luminosity expressed in terms of
the luminosity of the sun
Nearest stars - answer-alpha centauri is the closest stars
(4.3 light years) from the sun. Most of the nearest stars
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are in the lower right of the hr diagram. They are the
cooler and dimmer parts
Brightest stars - answer-they are warm and very luminous.
Sirius they have high luminosity
The properties of a star - answer-luminosity, mass, size,
temperature, and age
Size and temperature of a star directly affect - answer-
luminosity (larger size and higher temperatures reflect a
greater luminosity)
Main sequence stars are in a line from the upper left of the
diagram to the lower right with the sun in the middle -
answer-stars on the main sequence burn the hydrogen
and helium into their cores (proton, proton chain)
Mass determines where on the main sequence (red line)
the star lives - answer-upper left means the more massive
stars and the lower right are the lower-mass stars
What are some stars that are not on the main sequence? -
answer-red giants (supergiants) and white dwarfs
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What is step two of the proton proton chain - answer-the
deuterium nucleus (one proton and one neutron) then
collides with another proton and makes a helium 3
nucleus. During this step, some more energy is released
What happens during step three of the proton-proton
chain? - answer-the helium 3 nuclei which both contain
two protons and one neutron then collide together to form
the helium 4 nuclei
Planetary nebula - answer-the layers outside fo the core of
a low to intermediate-mass star
White dwarfs - answer-these are held up against gravity
but more by the pressure of the electrons. These are the
end states of a former-star's core (about the size of the
earth)
More massive stars have how much of a different life span
- answer-as the mass increases, the life of the stars
becomes shorter
The life cycle of a main sequence star - answer-at first, the
hydrogen core burns when the star is on the main
ASTRO 7N EXAM 3|| LATEST COMPLETE EXAM WITH
QUESTIONS AND ANSWERS|| VERIFIED EXAM!!!
Hertsprung-russel diagram - answer-shows the brightness
of the stars on a scale. Plots the luminosity (y-axis)
against the star's surface temperature (x-axis) *the surface
temperature gets hotter from right to left, so the hotter
stars are bluer and the cooler stars are redder. The closer
that you get to the y axis, the hotter the surface
temperature gets
The spectral class of stars - answer-from hottest to coldest
they are ranked obafgkm
Obafgkm - answer-oh be a fine girl kiss me
We determine the spectral class of a star using the -
answer-absorption spectrum
The vertical axis of the hertsprung-russel diagram -
answer-represents the luminosity expressed in terms of
the luminosity of the sun
Nearest stars - answer-alpha centauri is the closest stars
(4.3 light years) from the sun. Most of the nearest stars
,2|Page
are in the lower right of the hr diagram. They are the
cooler and dimmer parts
Brightest stars - answer-they are warm and very luminous.
Sirius they have high luminosity
The properties of a star - answer-luminosity, mass, size,
temperature, and age
Size and temperature of a star directly affect - answer-
luminosity (larger size and higher temperatures reflect a
greater luminosity)
Main sequence stars are in a line from the upper left of the
diagram to the lower right with the sun in the middle -
answer-stars on the main sequence burn the hydrogen
and helium into their cores (proton, proton chain)
Mass determines where on the main sequence (red line)
the star lives - answer-upper left means the more massive
stars and the lower right are the lower-mass stars
What are some stars that are not on the main sequence? -
answer-red giants (supergiants) and white dwarfs
, 3|Page
What is step two of the proton proton chain - answer-the
deuterium nucleus (one proton and one neutron) then
collides with another proton and makes a helium 3
nucleus. During this step, some more energy is released
What happens during step three of the proton-proton
chain? - answer-the helium 3 nuclei which both contain
two protons and one neutron then collide together to form
the helium 4 nuclei
Planetary nebula - answer-the layers outside fo the core of
a low to intermediate-mass star
White dwarfs - answer-these are held up against gravity
but more by the pressure of the electrons. These are the
end states of a former-star's core (about the size of the
earth)
More massive stars have how much of a different life span
- answer-as the mass increases, the life of the stars
becomes shorter
The life cycle of a main sequence star - answer-at first, the
hydrogen core burns when the star is on the main
