1. Light and Waves Review

2. light is a form of energy.
What is light?
light is a form of energy.

3. What are two ways we know light is energy?
1. light can do work.
2. light can be changed to and from different forms of energy.

4. What makes or produces light?
Light can be produced from energy transformations or from electrons popping back down energy levels from an excited state.

5. Invisibly Straight Fast
How does light travel?
Invisibly
Straight
Fast

6. What two things happen to light energy as it leaves the source?
As light leaves the source the light gets weaker (dimmer) and spreads out in all directions.

7. What is produced when light is blocked?
An shadow is produced when light is blocked.

8. How does light move from place to place?
light travels in electromagnetic waves or as a photon.

9. Where does color come from? (the very simple version)
Color comes from white light.

10. What is the process that splits white light into colors?
Refraction
Diffraction

11. What is an example of refraction?
Rainbows
Prisms
Spectra from beveled windows or fish tanks

12. What is an example of diffraction?
The special glasses
A spectroscope
The reflection off a CD/DVD

13. What is the top part of a wave called?
The top part of a wave is the crest.

14. What is the bottom part of a wave called?
The bottom part of a wave is the trough.

15. What do we call the part from one crest to the next crest?
The wavelength is the distance from one crest to the next or one trough to the next.

16. What do we call the distance from the middle to the top?
The distance from the middle of the wave to the crest is called the amplitude.

17. What is the number of waves per second?
The number of waves per second is called the frequency.

18. What unit of measurement do we use for frequency?
We measure frequency in Hertz (Hz).
(1 Hz = 1 wave per second)

19. What part of the wave determines color?
The wavelength of light determines the color.

20. What color of light has the longest wavelengths?
Red has the longest wavelengths.

21. What color of light has the shortest wavelengths?
Violet has the shortest wavelengths.

22. Do waves with larger or smaller wavelengths have more energy?

23. Give one example or use for radio waves.TV
Cell Phones
RC cars

24. Give one example or use for microwaves.
Microwave ovens
Radar for airplanes

25. Give one example or use for infrared radiation.
Thermal cameras
Television and electronic remotes

26. Give one example or use for visible light.
To see by
Photosynthesis
Solar energy

27. Give one example or use for ultraviolet radiation.
Causes sunburns
Black lights

28. Give one example or use for x rays.
To take a look at your bones
To look at luggage

29. Give one example or use for gamma rays.
To fight cancer (radiation therapy)

30. Where did the “stripes” of color come from in most of the spectra we saw?
The “stripes” of color come from different of combinations of electrons popping back down from a higher energy shell to a lower energy shell.

31. Why do fluorescent lights use less energy than incandescent lights?
Fluorescent lights do not produce a full spectrum so they don’t use as much energy to produce the light.

32. What happens when you take colors away from the spectrum?
You get new colors.

33. What do we call the set of colors that take away color?
Subtractive colors

34. What are the primary pigment colors or the subtractive colors?
Cyan, Magenta and Yellow

35. What happens when we mix all the subtractive colors?
All color is taken away and we get black (absence of color).

36. Print cartridges Test printing Color newsprint
What are some examples of the primary pigment colors or the subtractive colors?
Print cartridges
Test printing
Color newsprint

37. What happens when you add colors to the spectrum?
You get new colors.

38. What do we call the set of colors that add color up?
Additive colors

39. What are the primary light colors or the additive colors?
Red, Green and Blue

40. What happens when we mix all the additive colors?
All color is added and we get white (all colors combined).

41. What are some examples of the primary light colors or the additive colors?
Televisions
Monitors
Police lights
Stop lights
The cones in our eyes
3D glasses

42. What are the only 3 colors we can see?
Red, Green and Blue

43. That was the quiz!!!!!