The half-life of helium-5 is 7.6 × 10-22 seconds, and the half-life of helium-9 is 7 × 10-21 seconds. Approximately how many times greater is the half-life of helium-9 than that of helium-5?
A.
2 times
B.
7 times
C.
9 times
D.
11 times
Answers
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Answer:
Answer c 9 times greatet
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