Unformatted text preview: 2-4Modern Physics ConceptsChap. 25. In the Relativistic Heavy Ion Collider, nuclei of gold are accelerated to speedsof 99.95% the speed of light. These nuclei are almost spherical when at rest;however, as they move past the experimenters they appear considerably flat-tened in the direction of motion because of relativistic effects. Calculate theapparent diameter of such a gold nucleus in its direction of motion relative tothat perpendicular to the motion.Solution: The relativistically contracted diameter D to the uncontracted di-ameter Do when vjc = 0.9995 isDjDo = ";1 -v2jc2 = ";1 -0.99952 = ";1- (1- 0.0005)2~ VI -(1 -2 x 0.0005) = yI'O:OOi = 0.031.Hence the gold nucleus appears to Hatten to 3.1 % of its at-rest width.6. Muons are subatomic particles that have the negative charge of an electronbut are 206.77 times more massive. They are produced high in the atmosphereby cosmic rays colliding with nuclei of oxygen or nitrogen, and muons arethe dominant cosmic-ray contribution to background radiation at the earth's...
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This note was uploaded on 02/01/2010 for the course ECE 4130 taught by Professor Cady during the Spring '06 term at Cornell.
- Spring '06