Imagine you have a heap of candy, and every hour, half of that candy magically disappears. The time it takes for half the candy to disappear is its "half-life". Now, replace candy with radioactive atoms, and you get the idea! 😁

Long Half-lives: Imagine a magical candy that takes a year for just half of it to disappear! This is what long half-lives are like. It's when the half-life is much longer than the time we measure.

For long half-lives

• Direct Method: Use the equation A = λN
• Substitution & Rearrangement Method: T_1/2​= \(\frac {0.693}{A} × N\)

Glossary

• A: Activity of the sample (kinda like how active or hyper the candy is in disappearing!)
• λ (lambda): Decay constant (how fast our atoms are decaying)
• N: Total number of atoms