REVIEW QUESTIONS
1. Answer the review questions 1,4,8,9,10,14,17,19,20,26,
and 27 on page466 of Hewitt.
2. Answer the review questions 2,3,4,6 through 22, and 24
on page484 of Hewitt.
3. Answer the review questions 4 through 7,9 through
12,18,20 through 24,30, and 33,34 through 40 on page
561 of Hewitt.
EXERCISES
1. Complementary colors are two colors that
a. look good together.
b. are additive primary colors.
c. are subtractive primary colors.
d. produce white light when added together.
e. are right for each other.
2. The complementary color of blue is
a. red.
b. green.
c. yellow.
d. cyan.
e. magenta.
3. Colors on TV result from color
a. addition.
b. subtraction.
c. either of these.
d. neither of these.
4. A mixture of red and green pigments appears
a. orange.
b. yellow.
c. magenta.
d. blue.
e. blackish brown.
5. A blue object will appear black when illuminated with
a. blue light.
b. cyan light.
c. yellow light.
d. magenta light.
e. none of these.
6. If sunlight were green instead of white, the most comfortable
color to wear on a hot day would be
a. magenta.
b. yellow.
c. green.
d. blue.
e. violet.
7. Reflection occurs when outer electrons of atoms
a. are excited and deexcited, absorbing and emitting photons
in all directions.
b. are just excited.
c. only absorb photons.
d. none of these.
e. all of these.
8. To say that energy levels in an atom are discrete is to say the
energy levels are well-defined and
a. separate from one another.
b. separated from one another by the same energy increments.
c. continuous.
d. private.
9. Light is emitted when an electron
a. is boosted to a higher energy level.
b. makes a transition to a lower energy level.
c. neither of these.
10. A throbbing pulse of electromagnetic radiation is called a
a. photon.
b. proton.
c. lightron.
d. spaktron.
e. notron.
11. The energy of a photon is related to
a. the energy given to the atom that emits it.
b. the energy level difference through which it falls.
c. its frequency.
d. all of these.
e. none of these.
12. Which color carries the most energy?
a. red
b. green
c. blue
d. violet
e. all the same
13. The greater proportion of energy immediately converted
to heat rather than light occurs in
a. a fluorescent lamp.
b. an incandescent lamp.
c. both the same.
14. Discrete spectral lines occur when excitation takes place in a
a. solid.
b. liquid.
c. gas.
d. superconductor.
e. all of these.
15. Light frequency from an incandescent lamp depends on the
a. amount of electrical energy transformed.
b. rate of atomic and molecular vibrations.
c. voltage applied to the lamp.
d. transparency of glass.
e. both a. and c.
16. The dark lines in the sun's spectrum represent light that is
a. absorbed by the sun's atmosphere.
b. emitted by the sun.
c. not emitted by the sun.
17. Spectral lines take the shape of vertical lines because
a. the light is vertically polarized.
b. they are simply images of a vertical slit.
c. the energy levels in the atom are parallel to one another.
d. all of these.
e. none of these.
18. Astronomers can tell whether a star is approaching or
receding from earth by
a. its temperature.
b. its change in temperature.
c. its emission spectra.
d. the Doppler effect.
e. all of these.
19. Atoms can be excited by
a. thermal agitation.
b. electron impact.
c. photon impact.
d. all of these.
e. none of these.
20. The main visible difference between phosphorescent and
fluorescent materials is
a. an afterglow.
b. a difference in brightness.
c. the greenish color of phosphorescence.
21. The fact that iron absorption lines occur in the solar
spectrum directly indicates there is iron in the solar
a. atmosphere.
b. surface.
c. interior.
22. The radiation curve for a 'red hot' object peaks in the
a. infrared region.
b. green region.
c. ultraviolet region.
23. The radiation curve for a 'blue hot' object peaks in the
a. infrared region.
b. red region.
c. yellow region.
d. ultraviolet region.
24. A paint pigment that absorbs red light and gives off blue light
a. is fluorescent.
b. is phosphorescent.
c. is used in lasers.
d. is polarized.
e. does not exist.
25. The hottest star is the star that glows
a. red.
b. yellow.
c. blue.
26. The ratio of the energy of a photon to its frequency is
a. pi.
b. Planck's constant.
c. its speed.
d. the photon's wavelength.
e. none of these.
LESSON ASSIGNMENT
1. What frequencies of electromagnetic radiation do we feel as heat?
2. What determines the frequencies of the fundamental electronic
standing wave patterns?
3. How is fluorescence different from phosphorescence?
4. What does LASER stand for?
5. What type of deexcitation process is important in producing
LASER light?
6. What can one tell about a solid from its incandescent spectra?
7. How does molecular vibrational motion affect the energy
of electronic standing waves?
8. How can one measure whether a distant star is moving
towards the earth or moving away from the earth?
9. (a) What is a cold excitation process?
(b) What is a hot excitation process?
10. What happens to light when it is scattered by an atom or molecule?