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10 May, 12:21

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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  1. 10 May, 13:38
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    (7 * 10-21) / (7.6 * 10-22) = 9.21 times greater
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