How do the relative amounts of parent and daughter nuclei determine the
half-life of a radioactive isotope?
A. When all parent nuclei have become daughter nuclei, one half-life
has passed.
о B. When the number of daughter nuclei is less than the number of
parent nuclei, one half-life has passed.
C. When the number of daughter nuclei equals the number of parent
nuclei, one half-life has passed.
O
D.
When the number of daughter nuclei is greater than the number of
parent nuclei, one half-life has passed.