Question

Lead is the final product formed by a series of changes in
which the rate determining stage is the radioactive decay of
uranium-238 with a half-life of 4.5 × 10⁹ years. What would
be the age of a rock sample originally lead free in which the
molar proportion of uranium to lead is now 1 : 3?
(a) 1.5 × 10⁹ years (b) 2.25 × 10⁹ years
(c) 4.5 × 10⁸ years (d) 9.0 × 10⁹ years

Answer 1

Answer:

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