| A | B |
|---|
| radio waves | longest wavelength and lowest frequency of EM spectrum |
| infrared radiation (IR) | form of EM given off by warmer objects |
| visible light | only part of the EM spectrum that can be seen |
| ultraviolet radiation (UV) | part of the EM spectrum where frequency is high enough to begin to cause damage |
| x-rays | part of EM that has high enough frequency to travel through some types of matter WITHOUT being absorbed |
| gamma rays | shortest wavelength and highest frequency of the EM; emitted by nuclei of radioactive atoms |
| photoluminescence | caused by absorbing existing light energy; ex. glow-in-the-dark paint |
| bioluminescence | caused by chemical reactions INSIDE a living organism; ex. firefly |
| incandescence | caused by heat; ex. traditional light bulb |
| fluorescence | caused by electricity; emission in UV range so requires 2nd step to become visible |
| opaque | material that absorbs and/or reflects all visible light |
| translucent | material that allows SOME visible light to pass through it |
| transparent | material that allows ALL visible light to pass through it |
| rods | distinguish differences in brightness |
| cones | distinguish colors and shapes |
| infrasonic | frequencies below what humans can hear, such as thunder |
| ultrasonic | frequencies above what humans can hear, such as used in ultrasound equipment |
| pitch | the "highness" or "lowness" of sound |
| intensity | measure of the amount of energy in a wave |
| sonogram | graphical representation of sound |
| echo | caused by reverberation |
| reverberation | reflections of sound waves off objects |
