Question: A scientist has a 1 . 8 - gg sample of pure strontium - 9 1 , 9 1 3 8 Sr 3 8 9

A scientist has a 1.8-gg sample of pure strontium-91,9138Sr3891Sr. The half-life of strontium-91 is 9.70h9.70h. Part (a)
Determine its decay constant in units of s1s1. Part (b)
Determine the initial number of nuclei strontium-91 nuclei initially in the sample. Part (c)
Determine the activity in units of becquerel after 18 hours.

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