| A | B |
|---|
| waves | tranfer energy from place to place |
| longitudinal waves | particles move back and forth |
| frequency | # of complete waves in each second |
| medium | substance through which a wave travels |
| hertz | measure frequency |
| features of a wave | amplitude,wavelength and frequency |
| compression | squeezing together |
| refracted | when light is bent |
| vacuum | empty space; no air |
| vibration | rapid back and forth motion |
| echo | reflected sound |
| speed of wave | frequency times wavelength |
| prism | triangular glass that separates light |
| photon | bundle of energy |
| ray | straight line showing directionof light |
| opaque | no light relected |
| luminous | give off own light |
| translucent | some light passes through |
| illuminated | objects that reflect light |
| visible spectrum;ROY G BIV | 7 colors |
