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WorksheetsCalculating Half Life
Total questions: 8
Worksheet time: 40mins
The half-life of Iodine-131 is 8.10 days. How many days will it take a 50g sample to decay to 6.25g?
8.10 days
16.2 days
24.3 days
32.4 days
Carbon-14 has a half-life of 5,370 years. How many grams of a 144 g sample of Carbon-14 will remain after
17,190 years.
144 g
72 g
36 g
18 g
A 208 g sample of Sodium-24 decays to 13 g of Na-24 in 60 hours. How many hours is the half-life of Na-24?
4 hours
14 hours
15 hours
20 hours
Tin-126 has a half life of 100,000 years. How many years does it take to decay 100 g of Sn-126 to 12.5 g?
200,000 years
300,000 years
400,000 years
500, 000 years
The half-life of Cobalt-60 is 5.26 years. If 50 grams are left after 15.8 years, how many grams were in the original sample?
400 g
200 g
100 g
50 g
If the half-life of tritium is 12.26 years, what percentage would be left after 12.26 years?
100%
50%
25%
It would all become daughter material
Isotopes have different numbers of
protons.
neutrons.
electrons.
nuclei.
Half life (in radioactivity) is the amount of time it takes for half of a radioactive sample to
split.
combine.
decay.
become parent material.
