Fundamentals of Light
Practice Test
1.
__________ is the rate at which visible light is emitted from an object.
a.
Illuminated flux
b.
Luminous flux
c.
Frequency flux
d.
Amplitude flux
Hint
2.
A 225-N weight has one horizontal rope exerting a force of 98.0 N on it. What are the magnitude and direction of the force needed to put the weight into equilibrium?
a.
2.45×10
2
N at 293°
b.
1.27×10
2
N at 113°
c.
2.45×10
1
N at 113°
d.
2.45×10
2
N at 113°
Hint
3.
Water boils at 100° on the __________ temperature scale.
a.
Kelvin
b.
Celsius
c.
Fahrenheit
d.
Molecular
Hint
4.
A __________ wave bounces off a boundary.
a.
surface
b.
reflected
c.
transverse
d.
incident
Hint
5.
In Figure 14-4, if you doubled the mass of the pendulum, what effect, if any, would it have on its period?
a.
The new period would be the old period, divided by the square root of two.
b.
It would have no effect.
c.
The new period would be half the old period.
d.
The new period would be the old period, times the square root of two.
Hint
6.
Thermodynamics is the study of __________.
a.
sound
b.
light
c.
stars
d.
heat
Hint
7.
In Figure 14-9, how much time elapses between pictures a and c?
a.
0.04 s
b.
0.02 s
c.
25 s
d.
Not enough information is given to answer this question.
Hint
8.
A car is accelerated uniformily at the rate of 0.50 m/s
2
for 1.0×
1
s. Its final velocity is 23 m/s. What is the initial velocity?
a.
28 m/s
2
b.
18 m/s
c.
18 m/s
2
d.
28 m/s
Hint
9.
In Figure 3-3, if the acceleration were calculated using points at
t
= 0.00 s and
t
= 4.00 s, what would it be?
a.
10.00 m/s
2
b.
4.00 m/s
2
c.
5.00 m/s
2
d.
2.50 m/s
2
Hint
10.
__________ is the change in direction of a wave when it intersects a boundary between two different media.
a.
Reflection
b.
Diffusion
c.
Diffraction
d.
Refraction
Hint
11.
What mathematical expression relates frequency to period?
a.
f
= 1/
T
b.
1/
f
= 1/
T
c.
f
= 2
T
d.
f
=
T
Hint
12.
In Figure 3-19, what is the displacement of the object between 0.0 and 5.0 s?
a.
5.0 m
b.
30.0 m
c.
75.0 m
d.
150.0 m
Hint
13.
The average kinetic energy of ice particles__________ as ice melts.
a.
remains constant
b.
reduces to zero
c.
increases
d.
decreases
Hint
14.
A 225-N weight has one horizontal rope exerting a force of 98.0 N on it. What are the magnitude and direction of the resultant force on the weight?
a.
2.45×10
2
N at 293°
b.
2.45×10
1
N at 293°
c.
2.45×10
2
N at 343°
d.
1.27×10
2
N at 315°
Hint
15.
A polarizer and analyzer will block all light if they are at __________ to each other.
a.
180° angles
b.
right angles
c.
parallel angles
d.
30° angles
Hint
16.
Which is an example of a heat engine?
a.
volcano
b.
solar panels
c.
automobile engine
d.
windmill
Hint
17.
If a car travels 100 km in a straight line in the first hour of its trip, 100 km in the next hour, and continues in this way, its motion is __________.
a.
accelerated
b.
irregular
c.
uniform
d.
dynamic
Hint
18.
__________ is the rate at which light falls on a surface.
a.
Illuminance
b.
Illuminance flux
c.
Luminous flux
d.
Fluorescence
Hint
19.
The formula
represents the period of a pendulum, T. What is the period of a 3.5 m-long pendulum on Earth?
a.
1.4 s
b.
3.2 s
c.
4.6 s
d.
3.8 s
Hint
20.
A second prism will change a spectrum back into white light. This shows that __________.
a.
white light is composed of colors
b.
prisms distort images
c.
prisms are transparent
d.
light travels at a constant speed
Hint
