Ater 200 days the activity of a sample of an unknown type
After 2.00 days, the activity of a sample of an unknown type ofradioactive material has decreased to 84.2% of the initialactivity.
(a) What is the half-life of this material?
(b) Can youidentify it by using the table of isotopes in Appendix B?
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after 200 days the activity of a sample of an unknown type ofradioactive material has decreased to 842 of the
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