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The radioactive isotope (95 Nb) has a half-life of 35 days. A sample containing this isotope...

The radioactive isotope (95 Nb) has a half-life of 35 days. A sample containing this isotope has an initial activity at (t = 0) of 4.50 x 10 ^8 Bq. Calculate the number of nuclei that will decay in the time interval between t1 = 30.0 hours and t2= 55.0 hours.
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