Download Physics Chapter 27

Physics Chapter 27
1. What is light?
2. What did ancients believe about light?
3. What are photons?
4. What is the speed of light? How is it calculated?
5. What is a light – year?
6. What are electromagnetic waves?
7. What is an electromagnetic spectrum?
8. What is the difference between infrared and ultraviolet?
9. Is it correct to say that a radio wave is a low-frequency light wave? Is a radio
wave also a sound wave?
10. What does transparent mean?
11. Can you get a sunburn through window glass? Can you get a sunburn through a
wet T-shirt?
12. Why is something that is wet darker than something that is dry?
13. What does opaque mean?
14. Why is glass transparent to visible light, but opaque to ultraviolet and infrared?
15. What is a ray?
16. What is a shadow?
17. What is the difference between an umbra and a penumbra?
18. Why are lunar eclipses more commonly seen than solar eclipses?
19. What does polarization mean?
20. Which eye do you use more? To test, hold your finger at arm’s length. With both
eyes open, look past your finger to a distant object. Close your right eye. Does
your finger jump to the right? If so, then you use your right eye more. Repeating
using your other eye. Is a left handed person more likely to be left eyed or right
eyed?
21. Try the exercise on page 416.
22. Do the question on page 417.
23. What is a stereogram? Try the example on page 418.
24. Try the optical illusions on page 418.
Physics Chapter 28
1. What is a spectrum?
2. What is white light?
3. What does color depend on?
4. What is the difference between white and black?
5. What is a pigment?
6. When red light shines on a red rose, why do the leaves become warmer than the
petals?
7. When green light shines on a red rose, why do the petals look black?
8. What color does a ripe banana appear when illuminated with red light? With
yellow light? With green light? With blue light?
9. What is the radiation curve?
10. What are the additive primary colors and how do they make other colors?
11. What are complementary colors?
12. What is the complementary color of magenta, blue, and cyan?
13. What color does red light plus blue light appear?
14. What color does white light minus yellow light appear?
15. What color does white light minus green light appear?
16. Try the activity on page 429.
17. What are subtractive primary colors?
18. If there is a red pigment, what color will it reflect and what color will it absorb?
What about yellow, magenta, and green?
19. What does scatters mean?
20. Why is the sky blue?
21. What are sunsets red?
22. If molecules in the sky scattered low-frequency light more than high-frequency
light, how would the colors of the sky and sunsets appear?
23. What is water greenish blue?
24. What is a spectroscope?
25. What is a line spectrum?
26. In a darkened room in front of a white wall you cast shadows of your hand by two
colored lamps, red and green. The color of the wall, and the red light shadow, and
green light shadow, will appear:
a. Yellow, red and green
b. Yellow green, red
c. Red, green, and red
d. Green, red and yellow
e. Red, yellow, and green