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
A. always 2.
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