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Ch. 12 EMEnergy
Science vocabulary Ch. 12 Electromagnetic Energy
| Term | Definition |
|---|---|
| medium | Substance through which some waves travel, can be solid, liquid, or gas |
| sound | Travels through a medium by vibrating the particles of that substance |
| wavelength | Distance between crest to crest or trough to trough on a wave |
| vacuum | Empty space that light can travel through not sound |
| refraction | When waves bend as they move from one medium to another |
| diffraction | Bending of waves around a barrier |
| reflection | Bouncing of waves back after a wave strikes a surface |
| ultraviolet radiation | Part of sunlight that causes sunburn and skin cancer, some blocked by ozone layer |
| visible light | The only electromagnetic energy we can see, made up of ROYGBIV (colors of rainbow) |
| infrared radiation | Heat radiated by objects |
| electromagnetic energy | Can travel through a medium or a vacuum and have different wavelengths |
| expand | An object is heated and the particles in thesubstance move faster and further apart |
| contract | An object is cooled, heat energy is removed andparticles move slower and closer |
| temperature | The average kinetic energy of a substance changedby heat being removed or added |
| boiling point | Temperature at which water will evaporate |
| freezing point | Temperature at which water will freeze |
| evaporation | Liquid changes into a gas |
| condensation | Gas changes into a liquid |
| freezing | Liquid changes into a solid |
| melting | Solid changes into a liquid |
| convection | Flow of energy within a gas or liquid determined by differences in density |
| conduction | Flow of energy through solids caused by collisions of atoms or molecules |
| radiation | Energy transferred through empty space or a medium |
| convection currents | Circulation of energy in liquids and gasses |
| particles | smallest unit of matter |
| frequency | the number of waves that occur in one second; how fast a wave moves; measured in Hertz (Hz) cycles/second |
| amplitude | a measure of a wave's height (rest to crest or rest to trough); tells how much energy a wave has. As amplitude increases, energy increases. (ex. as amplitude increases, sound(loudness) increases) |
| rarefaction | the region in a compression (longitudinal) wave where the particles are apart; compression- is the opposite; where the particles are closest. |
Created by:
dlaino
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