1. 4th Grade Science
Sound and Light

2. Vibration
A quick back-and-forth movement of matter.

3. Sound
A form of energy that travels through the air (in waves).

4. Pitch
How high or low a sound is.

5. frequency
The number of vibrations per unit of time.

6. transparent
Allowing light to pass through.

7. Opaque
Allowing no light to pass through- the light is absorbed of reflected.

8. translucent
Allowing only some light to pass through.

9. reflection
The bouncing of light off an object.

10. light
One small part of a range of energy known as the electromagnetic spectrum.

11. prism
A transparent solid body often having a triangular basis for separating a light into a spectrum (ROY G BIV), or for reflecting rays of light.

12. Visible spectrum
A band of colors produced when sunlight is passed through a prism visible to the eye.

13. Concave lens
A lens that is thicker at the edges than it is at the center.

14. Convex lens
A lens that is thicker at the center than it is at the edges.

15. refract
The bending of light as it moves from one material to another.