The isotope "sr has a half-life of 28.8 years. what is the activity, measured in atoms/second, of a 50 mg sample of "sr? (10 pts.)

Activity of Sr isotope is .

Explanation:

Mass of the Sr isotope = 50 mg  =0.050 g

Moles of Sr isotope =

Number atoms of of Sr isotope:

Half life of the Sr =

Activity of the Sr isotope = k

Activity in atom/second:

= Number of atoms × k

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