Question #1dc8f
1 Answer
It is four.
Explanation:
The half life of any substance is given by:
Hence
We want to find:
Substituting the previous equations into the above gives
For a sample of N atoms, the activity, A, is given by:
Where
So for sample 1:
and for sample 2:
We are told that that
and also
Substituting both of these into equation 2 we get:
So
Comparing equation 1 and 3 we can see that:
and so
Hence the ratio of halve lives is 4 (by comparing this result to equation A)