Physics Principles and Problems 2009

Section 16.1 : Illumination

Self-Check Quizzes

1
Which is not a luminous source?
A)fluorescent lightbulbs
B)computer monitors
C)reflectors embedded in the road
D)a flashlight
2
What is a candela a unit of measure for?
  Need a Hint?
A)luminous flux
B)luminous intensity
C)illuminance
D)illumination
3
What simplification is made to use the equation <a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078807220/617984/SC_Eq_Ch16_1.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"> (4.0K)</a> in determining how much light reaches a surface.
A)The radius of the sphere is 1 m.
B)The light intensity is the same as that striking a sphere.
C)The source is a point source and the light strikes the surface perpendicularly.
D)E and P are directly proportional when r is constant.
4
What is the luminance of a table lighted by a 1750-lm light 4 m above?
A)8.44 lx
B)34.8 lx
C)139 lx
D)84.4 lx
5
What did Michelson use to make measurements of the speed of light?
A)<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078807220/617984/SC_Eq_Ch16_1.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"> (4.0K)</a>
B)a light meter
C)the orbit of Io around Jupiter
D)rotating mirrors on two California mountains
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