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A sample of radioactive isotope is found to
have an activity of 110 Bq imediately after
it is pulled from the reactor that formed the
isotope. Its activity 1 h, 20 min later is
measured to be 89 Bq.
Find the decay constant of the sample.
Answer in units of h-.
Find the half-life of the sample.
Answer in units of h.
How many radioactive nuclei were there in the
sample initially?

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