| A | B |
|---|
| electromagnetic wave | transverse wave that transfers electric and magnetic energy (p.77) |
| electromagnetic radiation | the energy transferred by electromagnetic waves (p.77) |
| polarized light | light that vibrates in only one direction (p.78) |
| photoelectric effect | the movement of electrons in a substance when light is shined on it (p.79) |
| photon | a tiny particle or packet of light energy (p.79) |
| electromagnetic spectrum | the range of electromagnetic waves placed in a certain order (p.81) |
| radio wave | electromagnetic wave with the longest wavelength and lowest frequency (p.81) |
| microwave | radio wave with the shortest wavelength and the highest frequency (p.81) |
| radar | a system of detecting reflected radio waves (p.81) |
| magnetic resonance imaging | a process that uses radio waves to form pictures of the inside of the human body (p.83) |
| infrared ray | electromagnetic wave with higher frequency and shorter wavelength than radio waves (p.83) |
| thermogram | an image that shows regions of different temperatures in different colors (p.85) |
| visible light | electromagnetic waves that are visible to the human eye (p.86) |
| ultraviolet ray | electromagnetic wave with frequency higher than visible light but lower than X-rays (p.86) |
| X-ray | electromagnetic waves with higher frequencies than ultraviolet rays but shorter than gamma rays (p.87) |
| gamma ray | electromagnetic wave with the shortest wavelength and highest frequency (p.88) |
| illuminated | word used to describe an object that can be seen because it reflects light (p.90) |
| luminous | word used to describe an object that can be seen because it emits light (p.90) |
| spectroscope | an instrument used to view the different colors of light produced by different sources (p.90) |
| incandescent light | lights that glow when something inside them gets hot (p.90) |
| fluorescent light | light that glows when an electric current causes ultraviolet waves to strike a coating inside a tube (p.91) |
| neon light | glass tube willed with neon that produces light (p.91) |
| sodium vapor light | bulb containing solid sodium plus neon and argon gas that produce light (p.92) |
| tungsten-halogen light | bulb containing a tungsten filament and a halogen gas that produces light (p.93) |
| bioluminescence | light produced by organisms as a result of a chemical reaction (p.93) |
| amplitude modulation | method of transmitting radio signals by changing the amplitude of the waves (p.97) |
| frequency modulation | method of transmitting radio signals by changing the frequency of the waves (p.98) |
