Light and sound

2. Energy of moving objects.
4. The length between the compressions in a sound.
5. How high or low a sound is; determined by the frequency of the sound.
6. A band of colors, as seen in a rainbow, produced by separation of the components of light by their different degrees of refraction according to wavelength.
10. An object which light can pass through.
11. The measure that a sound wave travels from it s resting place.
12. Forms when the charged particles from the sun strikes atoms and molecules in Earth's atmosphere. They excite the atoms, causing them to light up and form an -----.
13. To watch something carefully and attentively.
16. The light reflected when sunlight hits a rain droplet.
17. A dark shape that appears on a surface when someone or something moves between the surface and the source of light.
18. To move back and forth.
20. vibrations that travel through the air or another medium.
21. When light is bent as it moves through one kind of matter to another.

1. ----- Light. Apparently colorless light, for example ordinary daylight. It contains all the wavelengths of the visible spectrum at equal intensity. frequency Measur
3. Unit of measurement to indicate the volume of sound.
5. Stored energy.
7. A reflection of sound.
8. An object which when all light is absorbed or reflected, no image can be seen.
9. Stream of light pointed in one direction.
10. Situated or extending across something.
11. When sound energy hits an object and is converted into another form of energy; the opposite of reflection.
14. Mesuredd from east to west.
15. Substance(solid, liquid, or gas) through which sound waves travel.
19. When light bounces off an object.