Multiple Choice
If an isotope has a half-life of 4 billion years, then in 4 billion years
A) all of the original amount will have decayed.
B) of the original amount will still remain.
C) of the original amount will still be present.
D) all of the original amount will still be present.
E) none of these
Correct Answer:

Verified
Correct Answer:
Verified
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