| A | B |
|---|
| Waves | disturbances that move energy w/o moving matter |
| mechanical wave | wave that uses matter to transfer energy |
| water wave | ripples on surface of pond |
| compressional waves | waves -matter in medium moves same direction as wave |
| transverse wave | matter in medium moves up/down or back/forth at right angles to direction wave travels |
| electromagnetic wave | waves that do not require matter to carry energy;can travel through a vacuum |
| sound wave | series of compression an rarefaction areas travelling through a substance;ex.-vibration of vocal chords |
| medium | matter through which a mechanical wave travels |
| crest | at top |
| trough | at bottom |
| radio waves | communication, microwaves |
| infrared rays | heat |
| visible light | seeing; shorter wavelengths/higher frequencies |
| ultraviolet rays | honeybees see, not humans |
| x-rays | check broken bones |
| gamma ray | diagnose/treat cancer; shortest wavelength, highest frequencies |
| thermogram | shows regions of different temperature |
| electromagnetic spectrum | list of waves in order of increasing frequency (strength) |
| crest to crest | transverse wave |
| greater amplitude (amt. of energy behind wave) | more energy |
| longer wavelengths | lower frequency |
| molecules squeezed together | compression |
| travel faster in gases | electromagnetic waves |
| molecules closer | compressional |
| molecules farther apart | rarefaction |
| molecules | vibrate back & forth but aren't travelling |
| frequency | # of vibrations per second |
| intensity | how strong pitch is |
| loudness | how loud a pitch is |
| amplitude | how high crests are/how deep troughs are |
| wave lengths | distance from top of one crest to top of next crest |
| wave speed | how fast a wave travels through a medium |
| speed of light faster than | speed of sound (see lightning first, then hear thunder) |
