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Waves transfer energy without transferring matter.
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Waves [FREE] - Longitudinal and transverse waves explained
Wave Speed [FREE] - How to measure how fast these waves are travelling
Sound [FREE] - Particle vibrations between 20 and 20,000 Hz, and how our ears pick these up
Ultrasound [FREE] - With a frequency higher than 20,000 Hz these have many uses
The Electromagnetic Spectrum - A range of transverse waves with many uses