| A | B |
|---|
| electromagnetic wave | vibrating electric and magnetic fields that move at the speed of light |
| electromagnetic radiation | the energy that EM waves transfer |
| polarized light | filtered light that consists of only horizontal or vertical waves |
| photoelectric effect | when photons knock an electron off of a metal surface |
| photon | a single packet of light energy |
| electromagnetic spectrum | the complete range of EM waves arranged in order of increasing frequency |
| radio waves | EM waves with the longest wavelength, used in braodcasting radio programs |
| radar | a system that uses microwaves to locate and monitor moving objects |
| microwaves | EM waves with frequencies between radio waves and infrared waves. used to heat food and communicate |
| infrared waves | waves with higher frequencies than visible light, used to detect heat signatures |
| visible light | EM waves that can be seen with the eye |
| ultraviolet rays | EM waves shorter than visible light, can damage or kill living cells |
| X-rays | EM waves that are longer than gamma rays but shorter than UV, used to image bone and teeth |
| gamma rays | the shortest waveslength and highest energy |
| amplitude modulation | a method of broadcasting by changing the amplitude of a radio wave |
| frequency modulation | a method of braodcasting by changing the frequency of a waves |
