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Half lives of two uranium isotopes U 238 and U 235 are known to be 4.5 ´ x 10 9 yr and 7.1 x 10 8 yr, respectively. If the earth was formed with equal amounts of the two isotopes, estimate the current age of the earth given that uranium ores are 99.29% of U 238 and 0.71 % of U 235 by number. A. 2 ´ 10 9 yr B. 4 ´ 10 9 yr C. 6 ´ 10 9 yr D. 8 ´ 10 9 yr Plz explain if solved....thanx


Half lives of two uranium isotopes U238 and U235 are known to be 4.5 ´x 109 yr and 7.1 x 108 yr, respectively. If the earth was formed with equal amounts of the two isotopes, estimate the current age of the earth given that uranium ores are 99.29% of U238 and 0.71 % of U235 by number.
 
A.        2 ´ 109 yr
B.         4 ´ 109 yr
C.         6 ´ 109 yr
D.        8 ´ 109 yr
Plz explain if solved....thanx


Grade:10

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