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Calcium-47, used to evaluate bone metabolism, has a half-life of 4.5 days. Part A Write the balanced nuclear equation for the beta decay of calcium-47. Express your answer as a nuclear equation. | ΑΣΦ ? A chemical reaction does not occur for this question. Submit Request Answer Part B How many milligrams of a 38-mg sample of calcium-47 remain after 54 days? Express your answer using two significant figures. VE | ΑΣΦ • C ? mg Request Answer Part C How many days have passed if 19.2 mg of calcium-47 decayed to 1.2 mg of calcium-47? Express your answer using two significant figures. IL ΑΣΦ 4 Ċ ? Request Answer Submit t = Submit days

Part A The half-life for the radioactive decay of calcium-47 is 4.5 d. If a sample has an activity of 3.0 Ci after 27 d, what was the initial activity of the sample? Express your answer using two significant figures. ΠΙΑΣΦ ? Request Answer Submit Ci