Infrared Rays. Heat Wave . Infrared Ray . Ray, Infrared . Rays, Infrared . Wave, Heat . Waves, Heat . Heat Waves . That portion of the electromagnetic spectrum usually sensed as heat. Infrared wavelengths are longer than those of visible light, extending into the microwave frequencies. They are used therapeutically as heat, and also to warm food in restaurants. . 1.00
S Wave. Secondary Wave . Shear Wave . Seismic wave of transverse body or shear. The movement of particles through the medium that is perpendicular to the wave propagation direction. It is slower than the P wave and its period is generally two times greater than the P wave. (Free translation from the original: Material IV - Glosario de Protección Civil, OPS, 1992) . 0.57
0
0
p Wave. Primary Wave . Compressional Wave . Longitudinal Wave . Compressional or longitudinal wave body generated by an earthquake. The movement of particles passing through the middle in the direction of wave propagation, causes compression and rarefaction. Its speed varies between 6 and 14 km/s and the period varies between 0.1 and 2.0 seconds. (Free translation from the original: Material IV - Glosario de Protección Civil, OPS, 1992) . 0.54