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Activity of a certain isotope

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The activity of a certain isotope dropped from 3200 Ci to 800 Ci in 12.0 years.

What is the half-life of this isotope (in years)?

How many half lives have elasped in a sample with a half life of 2 hours after 18 hours?

Calculate the number of half lives that elapse after 18 hours if a sample has a half life of 2 hours.For the nuclear reaction described in the following question, give the chemical symbol and mass number of the missing product. 

The beta decay of Y-90 yields a beta particle and _____________.

Reference no: EM131430377

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