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Correct option is C)

$[Pb]=2060.618×10_{−6} mol=3×10_{−9}mol$

$[U]=2380.238×106−6 mol=1×10_{−9}mol$

For rock-dating, $(1+[U][Pb] )=(2)_{y}$

$∴y=2=T_{50}t $

$∴t=3.0×10_{9}years$

$[U]=2380.238×106−6 mol=1×10_{−9}mol$

For rock-dating, $(1+[U][Pb] )=(2)_{y}$

$∴y=2=T_{50}t $

$∴t=3.0×10_{9}years$

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