A Sample of (Which Decays By $\beta$ -Emission)has an Activity of 14

question 33

Multiple Choice

A sample of (which decays by $\beta$ -emission) has an activity of 14.7 mCi.After 26.1 d it has an activity of 4.25 mCi.The half-life of ³²P is approximately

• A)3.03 d
• B)7.30 d
• C)12.1 d
• D)14.6 d
• E)24.2 d

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