| A | B |
|---|
| echo | the repeated sound made when sound waves reflect off a surface |
| echo | used by sonar devices to measure distanct |
| opaque | material that does not allow visible light to pass through |
| pitch | the highness or lowness of a sound |
| prism | a tool used to separate white light into bands of colored light |
| echolocation | used by bats and dolphins |
| law of reflection | the angle of incoming light is always equal to the angle of outgoing light |
| sound wave | an area of crowded particles followed by an area of widely spaced particles that move in all directions from vibration |
| translucent | a material that allows MOST light to pass through but scatters the light in many different directions causing objects on the other side of a translucent material to be blurry |
| transparent | a material that allows NEARLY all light to pass straight through to the other side |
| vibration | a back and forth motion |
| volume | the loudness or softness of a sound |
| amplitude | the amount of energy in a sound wave; it affects volume |
| wave length | the distance from the top of one wave to the top of the next wave |
| concave lens | helps you see FAR AWAY objects more clearly |
| convex lens | makes CLOSE UP objects appear larger |
| high pitch sounds | finger nail on the chalkboard, sound of a mosquito, a whistle |
| gases | sound travels slowest through this state of matter |
| solid | sound travels fastest through this state of matter |
| transparent materials | glass, Saran Wrap, eye glasses, clear water bottle |
| translucent materials | frosted glass, white copy paper, thin lollipops, moth's wings |
| opaque materials | wood, book, soccer ball, your skin and muscles |
| reflection | when light bounces off a surface |
| refraction | when light bends as it travels through a substance |
| mirror | an object that REFLECTS light |
| water | a substance that REFRACTS light |
