Physics Principles and Problems 2009

Chapter 16: Fundamentals of Light

Standardized Test Practice

1
The wavelength of a beam of light passing through a vacuum is 420 nm, What is the frequency of the light beam?
A)6.7×1014 Hz
B)5.1×1014 Hz
C)7.1×1014 Hz
D)3.8×1014 Hz
2
The illustration shows a lamp and a candle illuminating a screen positioned between them. If the lamp is moved to a distance d = 1.02 m, how much brighter must the lightbulb be than the candle to have the same illuminance on the screen?

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A)1.5 times
B)3 times
C)4.5 times
D)9 times
3
Which describes the combination of two primary colors of light to produce a secondary color of light?
A)Yellow light and blue light combine to produce green light.
B)Magenta light and cyan light combine to produce blue light.
C)Red light and green light combine to produce yellow light.
D)Green light and yellow light combine to produce white light.
4
If the luminous flux of a lightbulb is 1750 lm, what is the illuminance of a surface 2.0 m from the light source?
  Need a Hint?
A)140 lx
B)35 lx
C)28 lx
D)13 lx
5
An architect is designing the lighting for a school. The illuminance in the classrooms must be at least 37 lx on students' desks. If the light shining on each desk has a luminous flux of 4200 lm, what maximum distance above the desks can the lights be placed?
A)1.0 m
B)2.0 m
C)3.0 m
D)4.0 m
6
The 656-nm hydrogen emission line is observed to occur at 787 nm instead for a distant galaxy. Is this galaxy moving towards or away from Earth? How fast?
A)The galaxy is moving away from Earth at 16.6% the speed of light.
B)The galaxy is moving towards Earth at 16.6% the speed of light.
C)The galaxy is moving towards Earth at 20.0% the speed of light.
D)The galaxy is moving away from Earth at 20.0% the speed of light.
7
Which of the following statements is true?
A)Ordinary light contains only those waves vibrating parallel to its direction of travel.
B)Ordinary light contains waves vibrating in every direction perpendicular to its direction of travel.
C)Ordinary light contains waves vibrating in one direction perpendicular to its direction of travel.
D)Ordinary light contains waves that are polarized in one direction.
8
Linearly polarized light consists of waves __________ in the same plane.
A)reflected
B)displaced
C)oscillating
D)traveling
9
The illustration above shows a beam of light moving through polarizing filters. What fraction of the initial light intensity, I, emerges from the third filter?

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A)0

B)<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078807220/617924/ch16_eq5.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (1.0K)</a>

C)<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078807220/617924/ch16_eq6.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (1.0K)</a>

D)I
10
If the order of the filters were changed to 2, 1, 3, what fraction of the initial light intensity would emerge from the last filter?

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A)0

B)<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078807220/617924/ch16_eq5.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (1.0K)</a>

C)<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078807220/617924/ch16_eq6.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (1.0K)</a>

D)I
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