Lec17 - Class Assignments Extra Credit/Honors"Letter of...

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Class Assignments • Extra Credit/Honors – "Letter of Intent" due 5 p.m. Wed. – Warning on plagarism. .. • For Wed. – Read Ch. 15 + Do Online Quiz 05
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Upcoming Events Greg Laughlin will speakon “The Search forAnother Earth,” for this year’s “ Vernon Lecture” on Wednesday, Oct. 19, at 7:30 p.m., at the University of Delaware’s Clayton Hall Conference Center. Register for the event, which is freeand open to the public, at this website:http://darc.physics.udel.edu/wet/vernon/vernon.html
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Upcoming events, cont.
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Midterm #1 • Class Average 75.3 ; Median 76 – Short Answer mean 7.3; Multiple choice mean 75.7 • Grade distribution:
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The Sun’s Energy Source • First theories invoke chemical reactions or gravitational collapse. • chemical can not account for the Sun’s luminosity • gravitational energy can keep Sun shining for only 25 M illion yrs • 19 th -century geology indicated Earth was older than that • Nuclear physics led to answer • Sun generates energy via nuclear fusion reactions • Hydrogen converted into Helium in the Sun’s core • Mass lost transformed into energy: E = mc 2 • With Sun’s mass, provide energy to shine for 10 B illion yrs
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Striking a Balance Sun began as a cloud of gas undergoing gravitational collapse.
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Lec17 - Class Assignments Extra Credit/Honors"Letter of...

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