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AST 107 FINAL EXAM COMPLETE QUESTIONS AND ANSWERS
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AST 107 FINAL EXAM COMPLETE QUESTIONS AND ANSWERS
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AST 107 FINAL EXAM COMPLETE QUESTIONSAND ANSWERS
Assuming we can collect all the solar energy intersected by the Earth 24 hours a
day and 365 days a year, in 100% efficiency, and there is no reflection and
absorption loss by Earth's atmosphere. How does the collected solar energy in a
year compare with the energy consumption of the whole world in a year ? -
ANSWER The solar energy is 104times larger
In the center of the Sun, where the temperature is 16 million K, we would expect
essentially all the hydrogen to be - ANSWER ionized
Two ionized hydrogen atoms will - ANSWER Repel one another, since they both
have positive charges
What would happen if the temperature of the Sun's core increased suddenly by
e.g., 1%? - ANSWER The rate of fusion would increase, causing the core to
expand and cool back to close to its original temperature
What kind of radiation do you think shines out of the coreof the Sun? By the time
photons reach the surface of the Sun, they are mostly - ANSWER gamma rays /
visible light
Virtually all of the Sun's energy is generated - ANSWER In the inner 1.5% of its
volume
, If fusion in the solar core ceased today, worldwide panic would break out
tomorrow as the Sun began to grow dimmer - ANSWER No, it takes many
thousands of years for photons created in nuclear reactions at the solar core to
reach the surface
If we can observe the Sun with neutrinos in high angular resolution, the Sun in
neutrinos has - ANSWER a smaller size than the Sun in the visible light
If we can't see the Sun's interior, how do we know what it is like? - ANSWER
observations of solar quakes, observations of neutrinos, computer modeling
Some regions of the solar corona can have temperatures nearly comparable to
temperatures in the Sun's core for a short amount of time, where nuclear fusion
takes place. Fusion does not occur in the corona because - ANSWER The
density in the corona is too low
Photosphere - ANSWER the visible surface of the sun
Convection Zone - ANSWER Energy transported upward by rising hot gas
Radiation Zone - ANSWER Energy transported upward by photons
Core - ANSWER Energy generated by nuclear fusion
The temperature in and around the Sun - ANSWER drops as you move from the
center to the photosphere, then rises above the photosphere
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