Question

Of the nuclei in a

15. The half-life of a radioactive nucleus is the time it takes for
sample to decay.
A. 50 disintegrations
B. 100 units
C. half
D. one-fourth

Answer 1

C.half

Step-by-step explanation:

the half-life of a radioactive element is 'the time it takes for half the radioactive nuclei in a sample to decay'

Answer 2

C. half

Step-by-step explanation:

The half-life of a radioactive sample is the time it takes to decay 1/2 of its mass