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# Nuclear Energy: Half-life Definition

APES-IXK5F8

Which is the BEST description of the half-life of a radioactive isotope?

A

One half-life is the time required for one-half of an isotope to decay to another element.

B

One half-life is the time required for one-half of a given isotope to disappear.

C

One half-life is the time required for one-half of the isotopes atoms to dissolve.

D

One half-life is the time required for a radioactive sample to emit one-half of its radiation.

E

One half-life is the point at which one-half of the nuclides has become non-radioactive.