Asked by Nancy
I have: the half life of U-238 is 4.5 x 10^9 yr. A sample of rock of mass 1.6g produces 29 disintegrations per second. find percent by mass of U-238 in rock.
I have 4.5x 10^9x60x60x365x24=1.419x 10^17=
.693/1.419 x10^17 =4.883x10^-18 =rate
1.6/238=.006722 x 6.022 x10^23=4.048 x10^21
then 4.048x10^21 x 4.883 x 10^18=19766 disintegrations per second
29/19766 =.001467 x 100 =.146
is this correct?
I have 4.5x 10^9x60x60x365x24=1.419x 10^17=
.693/1.419 x10^17 =4.883x10^-18 =rate
1.6/238=.006722 x 6.022 x10^23=4.048 x10^21
then 4.048x10^21 x 4.883 x 10^18=19766 disintegrations per second
29/19766 =.001467 x 100 =.146
is this correct?
Answers
Answered by
aurora
yes it it. 0.15%
There are no AI answers yet. The ability to request AI answers is coming soon!
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.