
Physical Science
Quiz by Sendy De Leon
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- Q1
Describes how the universe expanded from an initial state of extremely high density and high temperature.Offers a comprehensive explanation for a broad range of observed phenomena
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_______ means star
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Formation of elements in the center of the star by nuclear reactions. Process by which elements are formed in the cores and shells of the stars through nuclear fusion reactions
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suggests that stars form due to the collapse of the dense regions of an atomic cloud
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Evolution of Stars
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Evolution of Stars
stellar core that forms when cloud collapses and the fragments contract
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Evolution of Stars
– protostar contracts and its temperature increases due to gravity; when gravitationalequilibrium is reached due to the release of positrons and neutrinos; contractions stop and main sequence staris formed
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Evolution of Stars
Hydrogen is fused to helium in the core of main sequence star; pressure in the core decreases. Gravity squeezes the star to a point where helium and hydrogen burning occurs.Helium is converted to carbon in the core Hydrogen is changed to helium in the shell
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Evolution of Stars
when most of helium in the core is carbon; rate of fusion decreases resulting in the squeezing ofstars. Star is depleted of its fuel. Over time, the outer material of the star is blown off into spaceOnly the hot inert carbon core will remainNo carbon fusion occurs here due to lack of mass
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Evolution of Stars
carbon fusion occurs in massive stars where they have enough mass and there is anincrease in temperature and pressure
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Star can fuse heavier elements in the core and in the shell around it.
Oxygen from carbon fusion; ________________________
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Star can fuse heavier elements in the core and in the shell around it
Magnesium from__________
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Star can fuse heavier elements in the core and in the shell around it.
silicon from___________
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Star can fuse heavier elements in the core and in the shell around it
iron from ________
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Evolution of Stars
cores of red giant stars start to collapse when it can no longer produce enough pressure to resistgravityThis will lead to its explosion; releasing a large amount of energy and produces other elements heavier thaniron.
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