Mae tonnau'n trosglwyddo egni heb drosglwyddo mater.

Choose your topic:

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

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