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Posted: **Wed May 04, 2022 10:15 am**

: 5 The Radioactive Isotope Of Lead Pb 209 Decays At A Rate Proportional To The Amount Present At Time T And Has A Half 1 (13.05 KiB) Viewed 22 times

5. The radioactive isotope of lead, Pb-209, decays at a rate proportional to the amount present at time t and has a half- life of 3.3 hours. If 1 gram of this isotope is present ini- tially, how long will it take for 90% of the lead to decay?