Section A
What is stellar evolution?
the process by which star changes over the course
of time
What does the Hertzsprung-Russell (H-R) diagram plot?
It plots stars based on their brightness (magnitude) and temperature.
What is nuclear fusion?
Is the process where two light atomic nuclei combine to form a heavier nucleus
What is the primary process through which stars produce energy?
Hydrogen fusion
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knock
Name the stages of stellar evolution mentioned in the presentation.
nebula, main sequence, red giant, supernova, neutron star, black hole
Which axis of the H-R diagram represents a star's brightness?
The vertical axis
Where does fusion occur in stars?
The core (center)
What does the equation E=mc² represent?
shows that a small amount of mass can be converted into a large amount of energy
cat
dog
What is a nebula?
Clouds of gas and dust in space
Name the spectral classes of stars listed in the presentation.
O, B, A, F, G, K, M
What element is primarily formed from the fusion of hydrogen nuclei?
Helium
What happens to hydrogen nuclei in the core of a star during fusion?
collides and fuse together
mr junior is
dumb (jk)
Describe the characteristics of a main sequence star.
fusion of hydrogen to helium in the core
What color do hotter stars appear on the H-R diagram?
Blue
How is nuclear fusion related to energy production in stars?
because the total mass of the resulting single nucleus is less than the mass of the two original nuclei
How long can the energy produced by stars power them?
for billions of years
nothing
you stayed?
What are the differences between neutron stars and black holes?
If the core is less dense, it becomes a neutron star. A neutron star is made almost all of neutrons. If the core is more dense, it becomes a black hole.
How does a star's temperature affect its position on the H-R diagram?
The temperature of a star determines the color (hotter stars are bluer, cooler stars are redder), the blue is on the left while the red are on the right
Explain how supernovae contribute to the formation of elements heavier than iron.
via a rapid neutron-capture mechanism known as the r-process
Explain how a small amount of mass can lead to a large amount of energy in the context of hydrogen fusion.
Einstein had shown some years earlier that a small amount of matter was equivalent to a large amount of energy
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