|
849. Problem 54.66 (RHK) A rock is found to contain 4.20 mg of
|
and 2.00 mg of
. We
may assume that the rock contained no lead at formation, all the lead now
present has arisen from the decay of the uranium. We have to find the age
of the rock. The half-life of Uranium is
|
Solution: Click For PDF Version A rock is found to contain 4.20 mg of
And, the number of
Let the number of
The half-life of
An equivalent form of the radioactive decay law is
We note that
Therefore,
And,
|
be
.
