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6. A certain isotope decays to 10.0% of its original amount in 3 hours. Suppose there
are 1.0 x 10¹ atoms of the isotope. What is the initial activity of the material?
a) 2.13 x 100 Bq b) 3.24 x 10" Bq c) 4.35 x 10¹⁰0 Bq d) 5.46 x 10 Bq
e) none of the above

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