Half life
Cards (21)
- What happens to unstable isotopes to become more stable?
- What do we call materials that contain unstable isotopes?
- Why can't we predict when a single radioactive isotope will decay?
- What can we determine from a large sample of radioactive isotopes?
- How is activity measured?
- What does one becquerel represent?
- If a sample has an activity of 600 becquerels, how many isotopes decay each second?
- What is half-life defined as?
- How can half-life be defined in terms of activity?
- How does the decay process affect the number of unstable particles over time?
- Why does the overall rate of decay decrease over time?
- What shape does the graph of activity against time typically take?
- How do you calculate half-life from a graph?
- If the activity drops from 600 to 300, how long did it take?
- What does a shorter half-life indicate about a radioactive sample?
- What device is used to find the activity of a radioactive sample?
- What does a Geiger Muller tube record?
- How do you estimate the activity from the count rate recorded by a Geiger Muller tube?
- If the half-life of a radioactive source is 40 hours, how many half-lives are in 120 hours?
- How many radioactive nuclei remain after three half-lives from 3 million?
- What is the final number of radioactive nuclei after halving three times from 3 million?