hajse

4. materials that transmit light and is scattered or diffused and cannot be reflected clearly to your eyes
6. the bouncing back of light when it strikes a surface
9. the back-and-forth movement of molecules
10. materials that allow all visible light to pass through them
12. a form of mechanical energy that is produced by the vibrations of particles in matter
14. sounds that are lower than 20Hz
15. tells you the number of waves that occurs for every second

1. materials that do not transmit light
2. the presence of all colors
3. the distance between two adjacent identical points in a wave
5. sounds that are above 20000Hz
7. refers to how soft or loud a sound is perceived by the listener
8. the measure of the energy of sound or amplitude
11. the height of the wave that tells the strength or amount of energy carried by the wave
13. the absence of all colors