The key idea
Activity depends both on how many unstable nuclei are present and on their decay constant: A = λN.
Why it matters
Start with the central idea, then test it against a concrete element or example. A scientific model is useful when we know what it explains — and where its limits are.
A picture to remember
Activity is the expected number of nuclear decays per unit time. Its SI unit, the becquerel, equals one decay per second.
The key idea
Activity depends both on how many unstable nuclei are present and on their decay constant: A = λN.
The key idea
Start with the central idea, then test it against a concrete element or example. A scientific model is useful when we know what it explains — and where its limits are.
Start with the central idea, then test it against a concrete element or example. A scientific model is useful when we know what it explains — and where its limits are.