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| Pregunta | Respuesta |
| What will an unstable nuclei do to become stable? | Spontaneously emit radiation |
| What rates do isotopes decay at? | Different rates |
| Which isotopes have higher activities? | Those which decay more often and more of the N nuclei which decay per second |
| What happens to the decay rate if we have a larger sample of the same substance? | There are more measurable decays per second due to the larger number of unstable nuclei |
| What is their a proportionality between in terms of decay? | Activity and number of decays (or change in number of unstable nuclei) |
| what is the decay constant? | The proportionality of an individual nuclei decaying per second |
| What are the units of decay constant? | S^-1 |
| On average what is the time taken for half of the nuclei in a sample to randomly decay? | Constant |
| What is the time taken independent of? | The initial number |
| What does the theory of the exponential nature of decay indicate? | That a sample will never fully decay |
| In practice what will actually happen? | The sample will eventually decay completely and its count rate will drop below the background count |
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