A wave is a disturbance that transfers energy. , , Waves that must travel through a medium are called mechanical waves. , , Waves that can travel through empty space without a medium are electromagnetic. , , Compression waves are called longitudinal. , , Transverse waves or s-waves are slower than longitudinal waves. , , Waves with a higher amplitude are represented as being farther away from their rest position. , , Wave speed is calculated by dividing the wavelength by the wave period. , , Primary waves are faster and stronger than secondary waves. , , Seismic waves are earthquake waves. , .

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