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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?
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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?

User Toto
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2 Answers

5 votes

Answer C, 9 Times greater

User Voo
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6 votes
(7 × 10-21) / ( 7.6 × 10-22) = 9.21 times greater
User Vlad Frolov
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