1.The half-life of Iodine-131 is 8 days. Your aunt has an overactive thyroid, so her doctor gives her a pill containing 1 gram of I-131. 32 days later, how many grams remain in her body?
2.A granite counter top comes from a rock formation that is 3,060,000 years old. 50% of the original zirconium-93 is still in the rock. What is the half-life of zirconium-93?
3.What percent of Radium-226 remains after 6488 years have passed?(halflife:1622 years)
4.A block of metal once contained 2000 atoms of lead-202. After some time passed, it now holds 250 atoms. How many half lives have gone by?
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