If Present in Equal Amounts When the Earth Was Formed, Calculate

question 11

Essay

If $${ } ^ { 232 } \mathrm { Th } \text { (half-life } 1.4 \times 10 ^ { 10 } \text { years) and } { } ^ { 238 } \mathrm { U } \text { (half-life } 4.5 \times 10 ^ { 9 } \text { years) were }$$
present in equal amounts when the earth was formed, calculate their relative abundance at present. Note: The age of the earth is 4.54 billion years.

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