The Half- Life of a Radioactive Isotope Is

Multiple Choice

The half- life of a radioactive isotope is

A) the time required for a nucleus of that isotope to partially decay.
B) half the time required for a nucleus of that isotope to decay.
C) half the time that it takes for a radioactive isotope to eat a large pizza.
D) the time required for the decay of half of a large sample of nuclei of that isotope.
E) half the time required for the decay of a large sample of nuclei of that isotope.