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

Echoes and the speed of sound

identify

Try it yourself

A pupil shouts towards the tall brick wall of a sports hall across an empty playground and hears the shout again a moment later. Which statement explains the second sound?

identify: name or select.

Choose one answera.The sound waves reflect from the wall and travel back to the pupil.b.The sound waves pass through the wall and return from its far side.c.The pupil’s ears keep vibrating for a moment after the shout.d.The wall starts to vibrate and makes a new sound of its own.

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Scope and sources

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

Cambridge IGCSE Physics 0625 (2026–2028): 3.4.6, 3.4.8, 3.4.9; Supplement 3.4.12. The speed of sound in air, water and steel (3.4.5) is SOUND01’s.

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

Official Cambridge syllabus