Midterm 2013

Would you expect y the abundance by mass of 4he to be

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Unformatted text preview: cal prediction of Big Bang Nucleosynthesis yields is the half ­life of the neutron tn (disagreements of ~1% have been reported in laboratory determinations of tn). Would you expect Y (the abundance by mass of 4He) to be increased or decreased by longer tn? To order of magnitude level, how much uncertainty does tn introduce into the prediction of Y? Explain your reasoning. #2. Hubble Constant. (a) Describe briefly (a few paragraphs at most each; diagrams are welcome) 3 techniques for the measurement of H0 that you find most promising. For each one, d...
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This note was uploaded on 11/05/2013 for the course AY 127 taught by Professor Kamionkowski,m during the Spring '08 term at Caltech.

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