There are 0.618μg of 206Pb and 0.238μg of 238U in a rock. If T50 of 238U is 1.5×109yr, age of the rock is :
1.5×109yr
3.0×109yr
0.75×109yr
4.5×109yr
A
1.5×109yr
B
0.75×109yr
C
3.0×109yr
D
4.5×109yr
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Solution
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[Pb]=0.618×10−6206mol=3×10−9mol
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