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1) Carbon-14 has a half-life of 5730 years. If you start with a 2.37 g sample, how much would remain after 17,190 years?
2 ) Manganese-56 is a beta emitter with a half-life of 2.6 hours. What is the mass of manganese-56 in a 500 mg sample at the end of 10.4 hours?
3) A sample of thorium-234 has a half-life of 24.1 days. If that sample is allowed to decay for 96.4 days and 4.67 grams remains, what was the original mass of the sample?
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