. A sample of Strontium-90 has a Half-Life of 28.1 years. How long will it take for a sample to decay to 12.5% of its original mass?
A sample of Ge-66 (Half-Life = 2.5 hours) sat for 10 hours and only 5 grams remain. What wog
the mass of the original sample?
w
Element X is a Radioisotope. If a 100-kg sample of Element X decays to 12.5 kg in 1 day, what
is the Half-Life of Element X in hours?
Strontium-90 (Half Life = 28.1 years) is used as a Radioactive Tracer in Medical and Agricultural
Studies. How many atoms out of a 1.68 x 1023 atom sample will remain undecayed after 56.2
years?
What percentage of a 900-gram sample of Potassium-37 (Half-Life = 1.23 seconds) exists after
6.15 seconds?