Atomic StructureMedium Exam FrequencyAQA

Half-Life

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 be part of a solid GCSE revision cycle.

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⏳ Counting Down the Atoms

Introduction 2

Understanding Half-Life

Deep Dive 3

Half-Life Decay Curve

Diagram 4

Finding Half-Life from Data

Key Facts 5

Uses Based on Half-Life

Key Facts 6

How It Works: Why the Curve Is Exponential

How It Works 7

Key Definitions

Definitions 8

Common Misconceptions

Misconceptions 9

Memory Aids

Memory Aid 10

Higher Tier Only: Net Decline After Multiple Half-Lives

Higher Tier 11

Exam Focus

Exam Focus 12

Exam Tips for Half-Life

Exam Tips 13

Topic Summary: Half-Life

Summary

Sample Flashcards

What is half-life?

Half-life is the time taken for half the unstable nuclei in a radioactive sample to decay, or the time for the activity of a radioactive source to fall to half its original value.

Why is radioactive decay described as random?

Radioactive decay is random because we cannot predict when any individual nucleus will decay. We can only predict the probability of decay and the average behaviour of large numbers of nuclei.

Sample Questions

What is the definition of half-life?

A. The time taken for all of the radioactive nuclei to decay
B. The time taken for half of the radioactive nuclei in a sample to decay
C. The time taken for the activity of a sample to double
D. Half of the time for a nucleus to become stable

1 markfoundation

Explain what is meant by saying radioactive decay is 'random and spontaneous'.

2 marksstandard

exam-style questions

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