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

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
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).
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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.
Background image of page 2
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. When they get to the Earth they can cause neutrons to
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 07/13/2010 for the course AST 301 taught by Professor Harvey during the Fall '07 term at University of Texas at Austin.

Page1 / 10

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

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online