The half-life of 131I is 8.04 days. c) Convert 0.550 ?Ci to the SI unit the becquerel. (d) Find the number of 131I nuclei necessary to produce a sample with an activity of 0.550 ?Ci. 131I nuclei (e) Suppose the activity of a certain 131I sample is 6.50 mCi at a given time. Find the number of half-lives the sample goes through in 40.2 d and the activity at the end of that period. (Enter your answer for the number of half-lives to at least one decimal place.) ? half-lives ?mCi

The half-life of 131I is 8.04 days. c) Convert 0.550 ?Ci to the SI unit the becquerel. (d) Find the number of 131I nuclei necessary to produce a sample with an activity of 0.550 ?Ci. 131I nuclei (e) Suppose the activity of a certain 131I sample is 6.50 mCi at a given time. Find the number of half-lives the sample goes through in 40.2 d and the activity at the end of that period. (Enter your answer for the number of half-lives to at least one decimal place.) ? half-lives ?mCi

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e half-life of 131I is 8.04 days.(a) Convert the half-life to seconds. s (b) Calculate the decay constant for this isotope. s−1 (c) Convert 0.550 ?Ci to the SI unit the becquerel. Bq (d) Find the number of 131I nuclei necessary to produce a sample with an activity of 0.550 ?Ci. 131I nuclei (e) Suppose the activity of a certain 131I sample is 6.50 mCi at a given time. Find the number of half-lives the sample goes through in 40.2 d and the activity at the end of that period. (Enter your answer for the number of half-lives to at least one decimal place.)half-livesmCi
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The half-life of 27Mg is 9.50 min. initially there were 3.70× 1012 27Mg nuclei present. How many 27Mg nuclei are left 29.0 min later? Please give your answer to 2 significant figures. Calculate the 27Mg activities (in Ci) at t = 0 and t = 29.0 min.
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As a staff scientist at a nuclear power plant, it is your job to understand radioactive substances used by your co-workers. In a particular radioactive sample, you found that the number of nuclei decreased to one-sixth the original number of nuclei over an 18 d period. Determine the half-life of the sample (in days).