14. Thallium-201 has a half-life of 73 hours. If 4.0 mg of thallium-201 disintegrates over a period of 5.0 days, how man

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14 Thallium 201 Has A Half Life Of 73 Hours If 4 0 Mg Of Thallium 201 Disintegrates Over A Period Of 5 0 Days How Man 1 (33.74 KiB) Viewed 49 times

14. Thallium-201 has a half-life of 73 hours. If 4.0 mg of thallium-201 disintegrates over a period of 5.0 days, how many mg of thallium-201 will remain? 15. The half-life of "C is 20.3 min. What percentage of a sample will have decayed after 1.69 hours? 16. Radioactive copper, Cu, is found in quantities exceeding pollution standards in the sediments of a reservoir in a routine check on Monday. The standard allows up to 14 ppm/cubic meter of sediment. On Monday at 8 am, 59ppm/cubic meter were measured. The half life of Cu is 12.7 hours. When will the pollution level return to 14ppm?