Lecture_3_H_He - 1 1 http://t-square.gatech.edu/ 2 Lecture...

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Unformatted text preview: 1 1 http://t-square.gatech.edu/ 2 Lecture TAs Alvin Hough alvin.hough@eas.gatech.edu Office hours: ES&T 1235 12:30-2 MW Jake Leech leech@gatech.edu Office hours: ES&T 1229 10-11:30 TuTh 2 3 We know there universe has been expanding for the last 14 billion years 1. because matter looks denser in the far distance 2. Because radioactive decay is more active in more distant galaxies 3. Because recessional velocity is linearly related to distance 4. Because brightness decreases by 1/(distance) 2 4 Distant galaxies are retreating The more distant the galaxy, the faster the retreat Universe has been expanding from a single point for the past 14 billion years 3 5 How to build a habitable planet Need a place to put it Need something to make it out of (Fe, Mg, Si, O) 6 proton: mass=1 amu positively charged neutron: mass= 1amu no charge electron : very small mass, negatively charged Atom: nucleus (protons+neutrons) and electron "cloud Plasma : nucleii are ionized (electrons not associated with individual nucleii) 4 7 Elements (kinds of Atoms) are deFned by number of protons. Hydrogen atom has 1 proton Helium atom has 2 protons 8 Isotopes of each element are deFned by total number of nuclear particles (protons + neutrons) Deuterium ( 2 H or D) is an isotope of hydrogen that has 1 proton and 1 neutron in its nucleus 5 9 Periodic Table Z or p (the atomic or proton number Chemists: mostly interested in electron configuration as electron exchange and sharing determine chemical composition Nuclear physicists: interested in the properties of the nucleus this will be our focus as well 10 Temperature: measure of kinetic or movement energy of particles....
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This note was uploaded on 02/08/2011 for the course EAS 1601 taught by Professor Lynch during the Spring '08 term at Georgia Institute of Technology.

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Lecture_3_H_He - 1 1 http://t-square.gatech.edu/ 2 Lecture...

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