• Waves [FREE] - Longitudinal and transverse waves explained

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• Wave Speed [FREE] - How to measure how fast these waves are travelling

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•  Reflection, Transmission and Absorption [FREE]  - Bouncing waves

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•  Sound [FREE]  - Particle vibrations between 20 and 20,000 Hz, and how our ears pick these up 

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•  Ultrasound [FREE]  - With a frequency higher than 20,000 Hz these have many uses 

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•  Seismic Waves [FREE]  - Produced during earthquakes, these allow us to 'see' inside the Earth 

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• The Electromagnetic Spectrum - A range of transverse waves with many uses​

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• Radios - How they work

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• Refraction - Waves that change direction when they meet a boundary​

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•  Lenses  - These refract light and can form an image of an object

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•  Ray Diagrams  - Convex and concave lenses and drawing the images they make

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•  Images  - Real and virtual images and how we can calculate their magnification

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•  Colour [FREE]  - How filters work and how we see colour from reflected light

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•  Black Bodies  - There are perfect emitters and absorbers of radiation

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•  Radiation and the Earth  - Climate change is happening and this is why

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