Physics Light: 2A

22. Which will take longer to warm up in the summer sunlight a. a white house b. a black house c. a brown house d. a pink house

a. a white house

3. Your laptop screen shows a color photograph of a rainbow. The colors that you see on the screen arise by color ___ a. Addition b. Subtraction c. Multiplication d. Division

a. addition

4. An RGB TV screen shows a color photograph of a rainbow. The colors that you see on the screen arise by color ___ a. Addition b. Subtraction c. Multiplication d. Division

a. addition

12. A ballerina is wearing blue clothes. Her clothes look ___ under the pure blue lighting of the stage. a. Blue b. Green c. Red d. White

a. blue

9. The aurora borealis (northern lights) are sometimes green because ___ in the atmosphere is/are excited by cosmic rays, and then de-excited to give off green photons. a. Oxygen b. Neon c. Helium d. Electrons e. Protons

a. oxygen

17. A ballerina is wearing ___ clothes. Her clothes look red under the pure yellow lighting of the stage. a. Red b. Green c. Blue d. White

a. red

8. Clouds appear white because the water droplets scatter ___ light depending on the size of the droplets a. Red, green, blue b. Cyan, magenta c. Yellow, blue d. Cyan, magenta, yellow

a. red, green, blue

16. A ballerina is wearing ___ clothes. Her clothes look blue under the cyan lighting of the stage. a. Green b. Blue c. red d. white

b. blue

7. The sky appears blue during the daytime because of multiple scattering of ___ light by particles in the air a. Red b. Blue c. Green d. Yellow

b. blue

1. When these two colors are added we obtain white light. a. Additive primary colors b. Complementary colors c. Subtractive primary colors

b. complementary colors

19. Which is quicker to warm up in direct sunlight, clear or dark blue glass a. Clear b. Dark blue c. Both warm up at the same rate d. Neither warms up at all

b. dark blue

20. The sky is the most clear deep blue just after it has rained because the rain has ___ of particles in the sky a. Increased the number b. Reduced the number c. Kept the number the same d. Changed the color

b. reduced the number

5. Your textbook shows a color photograph of a rainbow. The colors that you see on the page arise by color ___ a. Addition b. Subtraction c. Multiplication d. Division

b. subtraction

6. What four colors are added together to create a color picture in your textbook a. Cyan, red, green, blue b. Magenta, red, green, blue c. Cyan, magenta, yellow, black d. Yellow, red, green, blue

c. cyan, magenta, yellow, black

18. A ballerina is wearing ___ clothes. Her clothes look green under the pure yellow lighting of the stage. a. Red b. white c. green d. black

c. green

11. A ballerina is wearing white clothes. Her clothes look ___ under the pure red lighting of the stage. a. Blue b. green c. red d. white

c. red

13. A ballerina is wearing ___ clothes. Her clothes look black under the pure blue lighting of the stage. a. Blue b. Cyan c. Red d. White

c. red

14. A ballerina is wearing ___ clothes. Her clothes look red under the magenta lighting of the stage. a. black b. Green c. Red d. White

c. red

2. When absorbing pigments of these three colors are added in different proportions, for instance on a painting, we can obtain any other desired color. a. Additive primary colors b. complementary colors c. subtractive primary colors

c. subtractive primary colors

15. A ballerina is wearing ___ clothes. Her clothes look black under the magenta lighting of the stage. a. Magenta b. Red c. blue d. green

d. green

21. Sunsets can appear reddish due to a. reflection from red smog in the air b. reflection from blue smog in the air c. reflection from red dust particles in the air d. reflection from blue dust particles in the air e. blue light being scattered away by small particles in the air f. red light being scattered away by large particles

e. blue light being scattered away by small particles in the air

10. A ballerina is wearing ___ clothes. Her clothes look red under the pure red lighting of the stage. a. Black b. Blue c. Only white d. Only red e. Red or white

e. red or white