For a sample of a given radioactive isotope,the ratio of the number of atoms of the isotope that exist at a time t to the number that exist at time t + t1/2 is
A) always 2.
B) dependent on how long t is after t = 0.
C) Dependent upon what the value of t1/2 is
D) always 1/2.
E) might be any number less than 1/2
Correct Answer:
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