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At a Particular Time,a Radioactive Source a Has a Strength ×\times

Question 103

Multiple Choice

At a particular time,a radioactive source A has a strength of 1.60 ×\times 1011 Bq and a half-life of 15.0 d,and a second source B has a strength of 8.50 ×\times 1011 Bq.Sources A and B have the same strength 45.0 d later.The half-life of B is


A) 0.19 d
B) 8.3 d
C) 2.8 d
D) 5.4 d
E) 28 d

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