| A | B |
|---|
| visible spectrum | light energy that can be seen and can be broken into the colors of the rainbow |
| wavelength | the distance from a point on a wave to the same point on the next wave |
| transparent | allows light to pass through so that whatever is behind can be seen |
| translucent | allows light to pass through but scatters it so that whatever is behind it cannot be clearly seen |
| opaque | does not allow light to pass through |
| transmit | to allow to pass through |
| absorb | to take in |
| reflect | to bounce back |
| convex lens | a lens that is thicker in the middle than at the edges |
| concave lens | a lens that is thinner in the middle than at the edge |
| vibrate | to move quickly back and forth |
| volume | the loudness or softness of a sound |
| pitch | the highness or lowness of a sound |
| stethoscope | an instrument used to hear the sounds of body organs |
| microphone | an instrument used to amplify voices, music, and other sounds |
| electric signal | a form of energy |
| amplify | to make stronger |
| bullhorn | an instrument with a built-in microphone that makes sounds louder |
| hearing aid | an instrument used to help people with a hearing problem hear better |
| graphic source | drawing,photograph, table, chart, or diagram that shows information visually |
