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

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• Radios - How they work

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

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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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