half life of u235 07038e9 years half life of u238...
Question: half life of u235 07038e9 years half life of u238...
Half life of U235= 0.7038E+9 years
Half life of U238= 4.68E+9 years
Assuming natural Uranium is currently 0.72% (atom%)
What was the atom% of U235 2.0E+9 years ago?
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