Question

sound waves belong to a group called mechanical waves - specifically, longitudinal waves. this means they need a material, called a medium, to travel through - unlike light waves that can move through empty space. sound waves involve compressions, where particles are pressed together, and rarefactions, where they spread out. the speed of sound changes depending on the material it travels through. it moves fastest through solids because the particles are packed closely together, making it easier for the energy to pass through. liquids come next, and sound waves move slowest through gases due to the spaced - out particles. sound wave shown on a computer program sound waves travel fastest in which medium? solid liquid gas

Explanation:

Sound waves are mechanical waves (longitudinal). They need a medium. The speed depends on the medium. Solids have closely - packed particles, which makes energy transfer (sound wave propagation) easier and faster compared to liquids (less - packed particles than solids) and gases (most spaced - out particles).

Answer:

solid