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Phy107HE2Rev_6per - Today Hour Exam 2 Wednesday Oct 27...

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1 Mon. Oct 25 Phy107 HE 2 review Hour Exam 2 : Wednesday, Oct. 27 In-class (1300 Sterling Hall) Twenty multiple-choice questions Will cover: 8.1-8.6 (Light and E&M) 9.1-9.5 (E&M waves and color) 10, 11 (Relativity) You should bring Your student ID 1 page notes, written double sided Calculator Pencil for marking answer sheet Mon. Oct 25 Phy107 HE 2 review Today Quickly finish material in Chapter 11. Review for Hour Exam 2. Mon. Oct 25 Phy107 HE 2 review From Last Time… General relativity motivated by Equivalence Principle No experiment can distinguish between force of gravity and an accelerated reference frame. General relativity does not consider gravity to be a force between massive objects Mass tells space-time how to curve Curvature of space-time dictates how objects move. Objects move along straight line in space-time Motion independent of mass of object (even light bends) Leads to effects such as Gravitational lensing Black holes Mon. Oct 25 Phy107 HE 2 review Black holes Light falls in a gravitational field. A sufficiently strong field should bind light into orbits. When escape velocity equals the speed of light, nothing can emerge. Inside the Schwarzschild radius light itself cannot escape. An object condensed within it’s Schwarzschild radius is called a black hole. Mon. Oct 25 Phy107 HE 2 review How do black holes form? Matter in the earth is held apart by electric forces. In the Sun, matter is held up by pressure associated with high temperature by nuclear fusion reactions. At higher density when fusion burns out, gravity can squeeze electrons into protons forming a neutron star. At even higher densities, a black hole forms Mon. Oct 25 Phy107 HE 2 review Black hole formation At sufficient density, no known force prevents the complete collapse of matter to a point- a black hole. Matter falling into black holes provides the only explanation for energetic objects seen throughout the universe. http:// antwrp . gsfc . nasa . gov / apod /ap 010921.html Black hole roaming the Milky Way.
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2 Mon. Oct 25 Phy107 HE 2 review Seeing Holes Light cannot escape from a black hole, so can’t see black hole itself, but can see matter falling into a hole. Gravitational forces stretch and rip matter: heats up. Very hot objects emit in X-rays (interior of Sun) Cygnus X-1. http://www.owlnet.rice.edu/~spac250/steve/ident.html Mon. Oct 25 Phy107 HE 2 review Exam Review: Topics by chapter Chap 8: Waves, interference, & electromagnetism Chap 9: EM radiation, light, color Chap 10: Special Relativity time & space Chap 11: Special Rel. energy, & General Relativity Mon. Oct 25 Phy107 HE 2 review Chapter 8: Wave properties Amplitude is the maximum displacement of string above the equilibrium position Wavelength , λ , is the distance between two
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