The activity of a pure radioactive sample becomes one-third of its initial value…
PHYSICS · Single correct · A Level · Physics · Nuclear physics · Nuclear physics
Problem
The activity of a pure radioactive sample becomes one-third of its initial value after some time. What fraction of the original number of undecayed nuclei is present at that instant?
(a) 32
(b) 31
(c) 31
(d) 41