Question: User: Visual Prompt for AI Video Generator: Prompt: A dual-simulation 3D animation showing wave types[cite: 15]. Top half: A transverse wave on a string where particles oscillate vertically perpendicular to wave propagation[cite: 15]. Bottom half: A longitudinal sound wave passing through air molecules, displaying alternating compression regions ('Compression') and rarefaction regions ('Rarefaction')[cite: 15]. Side graphic shows the Sun emitting invisible electromagnetic waves traveling through a vacuum to Earth at speed $c = 3 \times 10^8~m/s$[cite: 15]. English Voiceover & Text: Voiceover: "In transverse waves, particles vibrate perpendicularly to the wave direction, like waves on a string[cite: 15]. In longitudinal waves, particles vibrate parallel, forming compressions and rarefactions, like sound in air[cite: 15]. Mechanical waves need a medium, while electromagnetic waves like light can travel through a vacuum at the speed of light[cite: 15]!"