| A | B |
|---|
| absorption | a black t-shirt absorbs the light from the sun, making the shirt hot |
| compression | the part of a sound wave where the particles are close together |
| frequency | the number of waves that pass a certain point |
| opaque | doesn't allow light through, like a person |
| pitch | whether sound is high or low |
| reflection | when light rays bounce off a surface, like a mirror |
| refraction | when light rays bend, like looking at a pencil in a glass of water |
| translucent | allowing some light rays to pass through, like a glass shower door |
| transparent | allowing almost all light rays to pass through, like a window |
| wavelength | the distance between one point on one wave and a similar point on the next wave |
| electromagnetic waves | waves we can't see like radio waves, microwaves, infrared waves, etc. |
