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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