The half-life of 27Mg is 9.50 min. (a) Initially there were 4.80 × 1012 27Mg nuclei...

The half-life of 27Mg is 9.50 min. (a) Initially there were 4.80 × 1012 27Mg nuclei present. How many 27Mg nuclei are left 15.5 min later?

× 10 nuclei Enter your answer in scientific notation.

b) Calculate the 27Mg activities (in Ci) at t = 0 and t = 15.5 min.

t = 0 Ci

t = 15.5 Ci

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