Ratio of Uranium in a Specific Sample

Published: 2021-09-14 12:25:09
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Assignment 3
Question 1.
Ratio of molecules in initial concentration
235U/238U in a particular rock sample was 2.0%
235U half-life = 7.04 x 108 238U half-life = 4.5 x 109
4.5 billion years = 4.5 x 109
number of half-lives occurred = (total time elapsed ÷ length of half-life)
(4.5 x 10^9)/( 7.04 x 10^8) = 6.42 half lives (4.5 x 10^9)/(4.5 x 10^9) = 1 half life
(starting amount) x (1/2)number of half-lives
After 6.42 half-lives the fraction of U235 = 2 / 26.42 = .0234
After 1 half-life the fraction of U238 = 100 / 21 = 50
0.0234:50 = .046% U235
Question 2.
A single U-235 atom releases approximately 200 MeV (million electron volt) http://science.howstuffworks.com/nuclear-power1.htm

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