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Lecture13 - First Exam Tuesday March 9 5:00 pm 6:20 pm...

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First Exam Tuesday March 9 5:00 pm – 6:20 pm Physics Lecture Hall Closed book and notes Computer-graded multiple-choice questions Material covered: Text chapters 16 - 22 Lectures 1-14 (January 19 through March 4) Bring Student ID card and a #2 pencil Practice Exam is posted on class web page All necessary equations and constants will be given
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Black Holes Classical approach Escape velocity: as M increases or R decreases, v esc increases at some point v esc = c for M = 1 M sun R = 3 km this object is a black hole nothing, not even light can escape its gravity Schwarzschild radius (event horizon) point at which v esc = c R GM 2 v esc =
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Black holes in general relativity gravity is enormously strong near a black hole must use GR where space-time curvature becomes infinite is the Schwarzschild radius the black hole is a singularity inside this space and time become very complicated here
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Approaching the Schwarzschild radius tides become very strong objects stretched time slows down redshift becomes large To outside observers, objects seem to stop at the event horizon
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