half life Flashcards
1
Q
what is half life
A
The half-life of a radioactive isotope is the time it takes for the number of nuclei of the isotope in a sample to halve.
2
Q
what is another definition of half life
A
The half-life is also the time it takes for the count rate (or activity) from a sample containing the isotope to fall to half its initial level.
