astro102011 - Astronomy Oct 20th 2011 Matter can be...

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Astronomy Oct. 20 th , 2011 Matter can be converted to energy energy is stored in matter itself this mass-energy is what would be released if an amount of mass, m, were converted into energy E = mc 2 [ c = 3 x 10 8 m/s is the speed of light; m is in kg, then E is in joules.] Two types of nuclear reactions that release mass-energy Fission Fusion Less mass is present after than before the reaction. .. Human nuclear power plants use fission. (e.g., of uranium or plutonium) Cosmic power plants use fusion. (e.g., two hydrogen atoms fused to form one helium atom) Clicker question A Sun-like star puts out 9 x 10 26 Joules every second. The speed of light is 3 x 10 8 m/s. How much mass does the star convert to energy every second? E = mc 2 9 x 10 26 = m(3 x 10 8 ) 2 m = 10 10 That's, like, 394902384 fucking Hiroshima bombs every second. In the core and surface of the sun. Electrical charge: a fundamental property of matter Opposite ly charged particles attract each other Similarly charged particles repel each other.
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This note was uploaded on 04/04/2012 for the course ASTRON 101 taught by Professor Schneider during the Fall '08 term at UMass (Amherst).

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astro102011 - Astronomy Oct 20th 2011 Matter can be...

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