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Sound and Light PH V
Sound and Light PH Vocabulary
Term | Definition |
---|---|
wave | A disturbance that transfers energy from one place to another. A Wave Transports Energy and Not Matter. |
longitudinal wave | A mechanical wave in which the energy of the wave travels in the same direction as the medium. ex: sound waves, slinky pushed back and forth like an accordian. |
medium | A substance or material that carries the wave. |
mechanical wave | An energy wave that requires a medium through which to travel. CANNOT travel through space; sound, a mechanical wave, cannot travel through space but light, an electromagnetic wave, can travel through space. |
crest | The highest point on a transverse wave. |
transverse wave | A wave through which energy travels at right angles to the direction of the wave. ex: wiggling a jump rope up and down or back and forth. ALL light waves are transverse waves. |
trough | The lowest point on a transverse wave. |
compression | The points where molecules of matter are squeezed together on a longitudinal wave. |
rarefaction | The points where molecules of matter are spread apart on a longitudinal wave. |
amplitude | The maximum disturbance from a wave's rest position (normal). Remember: rest to crest |
wavelength | The distance between a point on one wave and the same point on the next wave; usually trough to trough or crest to crest. |
frequency | The number of waves that pass a certain point each second. |
seismic wave | Waves produced by earthquakes; they move in all directions from the point of origin. |
primary wave | Seismic waves that are longitudinal; Also called P-waves, they travel fastest and arrive at a specific point (a seismometer or a house) first. |
secondary wave | Seismic waves that are transverse; also called S-waves. Cannot travel through liquids so they stop at Earth's liquid core. |
reflection | When a wave hits a surface through which it cannot pass and bounces back. |
refraction (light) | The bending of a light as it enters a new medium. EX: light waves bend when passed through a prism = rainbow. |
elasticity | The ability of a material to bounce back after being disturbed. |