Which of the following description is NOT correct regarding "half-life" in an exponential decay problem?
A. Half-life is the length of time it takes an exponentially decaying quantity to decrease to
half its original amount.
B. Half-life is exactly half of the life time of the exponential decay substance.
C. Half-life is bigger than half of the life time because the exponential decay quantity
decreases very fast in the beginning
D. Both A and C
E. Both B and C.