27.1

27.2

27.3

27.4

27.5

27.6

27.7

27.8

27.9

27.10

27.11

27.12

-- Questions --

MULTIPLE CHOICE.

Choose the one alternative that best completes the statement or

answers the question.

27.13

1) Colors seen on TV result from color A) subtraction. B) addition. C) either of these. D) neither of these.

2) When the frequency of light matches the natural frequency of molecules in a material, light is A) transmitted. B) reflected. C) absorbed. D) none of these.

27.14

3) Red sunsets are due to lower frequencies of light that A) are scattered from larger particles in the air. B) appear reddish orange to the eye. C) are reflected by clouds and relatively large particles in the air. D) survive being scattered in the air. E) are refracted from larger particles in the air.

4) The colored dots that make up the color on a TV screen are A) red, green, yellow. B) red, blue, yellow. C) magenta, cyan, yellow. D) red, blue, green. E) yellow, blue, green.

27.15

5) Look at a full-color picture in a magazine with a magnifying glass and you'll see that the inks used are A) red, green, blue, and black. B) magenta, cyan, yellow, and black. C) red, green, and blue. D) magenta, cyan, and yellow. E) none of these.

6) The yellow clothes of a stage performer can be made to look black if illuminated only by light that is A) blue. B) magenta plus cyan. C) both of these. D) none of these.

27.16

7) Color depends on what characteristic of light? A) Its frequency B) Its wavelength C) both of these D) neither of these

8) Colors seen on the cover of our physics book result from color A) subtraction. B) addition. C) either of these. D) neither of these.

27.17

9) Magenta light is really a mixture of A) red and blue light. B) red and yellow light. C) yellow and green light. D) red and cyan light. E) none of these.

10) The solar radiation curve is A) a plot of light intensity versus distance from the sun. B) the path taken by the sun as it travels around the Earth. C) a plot of the colors of sunlight versus their frequencies. D) a plot of brightness of sunlight versus its frequency. E) a dent in the otherwise spherical sun.

27.18

11) Which will warm up quicker in sunlight? A) a piece of clear glass B) a piece of colored glass C) both the same

12) The greenish blue of water is evidence for the A) interaction between green and blue frequencies of light. B) reflection of red light. C) reflection of greenish-blue light. D) absorption of red light. E) absorption of greenish-blue light.

27.19

13) The redness of the lunar eclipse is evidence for the A) scattering of lower frequencies of light by the moon. B) refraction of sunsets and sunrises all around the world. C) dim light that is incident upon the moon by Jupiter and other planets. D) faintly radiating atoms in our own atmosphere when sunlight is not incident upon them. E) infrared light continually emitted by the moon.

14) The sky is the deepest blue A) just before a rainstorm. B) just after a rainstorm. C) when the air is humid. D) during a rainstorm. E) just before sunset.

27.20

15) The sun is more likely to appear red at sunset than in the middle of the day as a result of the

A) longer path of air through which sunlight travels. B) lower frequencies of light emitted late in the day by the sun. C) absorption effects of the smaller particles in the air. D) pollutants emitted by humans in daylight hours. E) scattering of lower frequencies by larger particles in the air.

27.21

-- Answers --

MULTIPLE CHOICE.

The one alternative that best completes the statement or

answers the question.

27.22

Chapter 27

1) Answer: B 2) Answer: C 3) Answer: D 4) Answer: D 5) Answer: B 6) Answer: C 7) Answer: C 8) Answer: A 9) Answer: A 10) Answer: D 11) Answer: B 12) Answer: D 13) Answer: B 14) Answer: B 15) Answer: A