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class16a - Monday Oct 6 Syllabus class notes and homeworks...

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Monday, Oct. 6 Syllabus, class notes, and homeworks are at: www.as.utexas.edu courses AST 301, Lacy Reading for this week: chapter 8 The Wednesday help session is in GRG 424 at 5:00 (for the entire semester).
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Forces that cause nuclear reactions We know of four types of forces or interactions between particles: gravitational: an attraction between any masses electromagnetic: an attraction or repulsion between charged particles. (opposites attract) weak: an interaction which can convert one kind of a particle into another. e.g., p + n + e + + ν strong: an attraction between the particles (protons and neutrons) in a nucleus. only occurs if the particles are very close together. Steven Weinberg (in U.T. Physics department) showed that electromagnetic and weak forces are related. Others are trying to find a theory combining all forces.
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Is it ‘Just a Theory’? Fusion only occurs very close to the center of the Sun. How can we be sure this is how the Sun generates energy? The neutrinos created when protons became neutrons and positrons during fusion are very unlikely to collide with anything while leaving the Sun.
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