A substance contains two Radon isotopes, 210 Rn [t1/2 = 2.42 h] and 211 Rn [t1/2 = 15 h]. At first, 20% of the decays come from 211 Rn. How long must one wait until 80% do so?
We need at least 10 more requests to produce the solution.
0 / 10 have requested this problem solution
The more requests, the faster the answer.