Worksheet: Radioactive Half-Lives
In this worksheet, we will practice using measurements of activity or isotope ratios to calculate the half-lives and decay constants of unstable nuclei.
Radon-222 decays by emission and is one of the largest sources of radiation exposure for many people.
Write a balanced equation for the decay of radon-222.
After 12.7 days, 90.0% of a sample of radon-222 has decayed. Calculate the half-life for the decay process.
Radon-222 is most hazardous if inhaled. Which properties of particles are responsible for this effect?
- AIt is weakly penetrating and weakly oxidizing.
- BIt is strongly penetrating and strongly reducing.
- CIt is weakly penetrating but strongly ionizing.
- DIt is strongly penetrating but weakly oxidizing.
- EIt is strongly penetrating but weakly ionizing.
What is the half-life of a radioactive material?
- AHalf of the time taken for all of the nuclei to decay
- BHalf of the average time taken for nuclei to decay
- CThe average time taken for nuclei to decay
- DThe inverse of the rate constant for the decay process
- EThe time taken for half of the nuclei to decay
What is the half-life of a radioactive material in terms of the rate constant for the radioactive decay, ?