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A certain substance has a half-life of 5.0 hours. How many nuclei of the substance are required to give an initial activity of 6.0 uCi?

A certain substance has a half-life of 5.0 hours. How many nuclei of the substance are required to give an initial activity of 6.0 uCi? 1 Ci = 3.7 x 1010 Bq? A 3.2 x 109 B 8.5 x 108 C 2.4 x 109 D 6.3 x 108 E 5.8 x 109

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