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

Independent final check

Page 03

Explain without the key

describe / calculate

Final check

A boat sounds its horn 765 m from a cliff, and the crew hears an echo. The speed of sound in air is 340 m/s. (a) Describe what the echo is. (b) Calculate how long after the horn sounds the crew hears the echo.

describe: give the features or what happens. calculate: work out the answer from the data.

Give your answer with its unit

Type numbers like 0.25 or 2.5x10^-3. Put the unit in its own box, for example g, cm3 or m/s. Leave the unit box empty if the quantity has no unit.

(b) Time to hear the echo

Number

Unit

(a) What the echo is

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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