This introduction covers ⏳ Counting Down the Atoms within Half-Life for GCSE Physics. Revise Half-Life in Atomic Structure for GCSE Physics with 13 exam-style questions and 23 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 1 of 13 in this topic. Use this introduction to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 1 of 13
Practice
13 questions
Recall
23 flashcards
⏳ Counting Down the Atoms
Imagine you have a jar of 1,000 unstable atoms. After one hour, 500 have decayed. After another hour, 250 remain. Then 125, then 62, then 31... The jar never fully empties — you always have half of what you started with each time the same interval passes. This predictable halving is called half-life, and it's one of the most powerful tools in science: archaeologists use it to date ancient artefacts, doctors use it to choose medical tracers, and geologists use it to date rocks billions of years old.