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Astro 7N exam 2 The Sun Questions and Answers
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Exam of 5 pages for the course Astro 7N at Astro 7N
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Astro 7N exam 2 The Sun Questionsand Answers
what is the sun mostly made of?
✓ ~~~gas
true or false the sun is stable due to balance of gravity and gas pressure in its hot
interior
✓ ~~~true
how hot is the sun?
✓ ~~~15 million degrees kelvin
what is the sun diameter?
✓ ~~~109Xearth
what is the sun mass?
✓ ~~~333,000xEarth
what is the sun luminosity equal to?
✓ ~~~4x10^24 100 Watt light bulbs
how much of all of the made of the solar system in in the sun?
✓ ~~~99.9%
how long has the sun been shining, and how much longer will it shine?
, ✓ ~~~4.5 billion
5.5 billion
are slightly-cooler regions on the Sun's surface due to magnetic activity
preventing hot material from rising in that region; have 11 year cycles
✓ ~~~sunspots
a long last source of energy in the stars
✓ ~~~nuclear fusion
what is nuclear fusion made of?
✓ ~~~4 protons combine to make helium 4 and release energy in gamma rays
a fusion process in which protons build together to form helium
✓ ~~~proton proton chain
the energy output from the [p chain comes from
✓ ~~~E=mc2
true or false the mass of a helium-4 nucleus is less than the mass of 4 protons
✓ ~~~true
at the center; high density and temperature; where nuclear reactions occur
and gamma rays are produced
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