Half life questions

1. Radioactive isotope X has a half-life of 7 days. If 598 MCi of substance X is released into the environment, how much will remain after 33 days


2. If a sample of I-131 is allowed to sit for 48 days some of the radioactive material will have undergone decay. If the half-life of I-131 is 8 days and the sample started out with a content of 600

, what is the content at the end of 48 days


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