Waves

The Waves topic covers common wave behaviour, the electromagnetic spectrum, light and sound. A small set of principles is applied in many different contexts, so diagrams and definitions matter as much as calculation.

A sensible learning order

Start with wavelength, frequency, amplitude and wave speed. Compare transverse and longitudinal waves, then study reflection, refraction and diffraction. Move next to the electromagnetic spectrum, followed by light, total internal reflection, lenses and sound.

What usually causes difficulty

Students can confuse a wave with the material carrying it, or describe what a ray diagram looks like without applying the drawing rules. Unit conversion is another common issue when frequency is given in kilohertz or wavelength in centimetres.

Use a ruler for ray work and label normals, angles and directions. In explanations, name the quantity that changes and the one that remains constant. In calculations, convert units before using wave speed, frequency or wavelength.

Core and Supplement

Every candidate needs the main wave properties and applications. Extended candidates add deeper refraction, critical-angle and lens work. The individual lessons label the exact boundary so Core students do not skip examinable material.

Use the question bank to alternate calculation, explanation and diagram questions. That mix is closer to the real demand than repeating one type of exercise.