Half-life is:
I.the time for a sample to decay completely.
II.constant for a given radioisotope.
III.the time required for half of a sample to decay.
IV.inversely proportional to the decay constant.

Question

Quizplus · Accepted Answer

Half-life is constant for a given radioisotope (II), is the time required for half of a sample to decay (III), and is inversely proportional to the decay constant (IV). It is not the time for a sample to decay completely (I).

Half-Life Is: I.the Time for a Sample to Decay Completely