Contents

Motion, forces and energy

Thermal physics

Waves

Electricity and magnetism

Magnets and magnetic fields
Static electricity and electric fieldsBeing prepared
Current and circuit diagramsBeing prepared
Voltage and resistanceBeing prepared
Series and parallel circuitsBeing prepared
Sensors and potential dividersBeing prepared
Electricity at homeBeing prepared
ElectromagnetsBeing prepared
The motor effectBeing prepared
Generators and inductionBeing prepared
Transformers and the gridBeing prepared

Nuclear physics

Inside the nucleusBeing prepared
Ionising radiation and safetyBeing prepared
Radioactive decay and half-lifeBeing prepared

Space physics

Earth, Sun and MoonBeing prepared
The Solar System and orbitsBeing prepared
Stars and their life cycleBeing prepared
The expanding UniverseBeing prepared

Part 1 of 2

Page 01

Making sound

identify / explain

Try it yourself

A plucked guitar string keeps sounding after the finger leaves. Identify the vibrating source and explain how sound starts in the air.

identify: name or select. explain: give reasons and connect them to evidence.

Build your answer

Vibrating source

How it starts sound

Your saved work

Answers, earlier attempts and your Pause and check notes stay in this browser. Export a copy to keep, to move to another device or to hand to your teacher. Importing a copy keeps your current answers and adds earlier attempts.

Import saved work

Scope and sources

Cambridge IGCSE Physics 0625 · 2026–2028 v2 · Original learning materials.

Cambridge IGCSE Physics 0625 (2026–2028): 3.4.1–3.4.5, 3.4.7; Supplement 3.4.10–3.4.11. Echoes, ultrasound and measuring sound speed belong to the next module.

Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.

Official Cambridge syllabus