Reflection and Mirrors
Practice Test
1.
In Figure 6-1, if the baseballs fell a vertical distance of 1.6 m from the first to the last image, what is the time interval between frames?
a.
0.071 s
b.
0.095 s
c.
0.23 s
d.
0.081 s
Hint
2.
The property of a straight line that is the ratio of the vertical difference between two points to the horizontal difference between the same two points is the __________.
a.
tangent
b.
rise
c.
slope
d.
intercept
Hint
3.
Mechanical waves require __________.
a.
a vacuum
b.
a medium
c.
a solid
d.
a gas
Hint
4.
In Figure 17-6, if the flame on the candle is 2 cm tall, how tall is the flame of the image?
a.
8 cm
b.
1 cm
c.
2 cm
d.
4 cm
Hint
5.
If you wanted to adjust the situation in Figure 17-13 to produce a real image, which one of the following options by itself would work?
a.
replace the object with a larger object.
b.
move the object out past the focal point
c.
replace the mirror with a convex mirror of the same focal length
d.
replace the mirror with another concave mirror of longer focal length
Hint
6.
In Figure 14-2, if the scale of the graph is 1 block = 10 N on the vertical axis and one block = 2 cm on the horizontal axis, what is the spring constant?
a.
250 N/m
b.
5 N/m
c.
20 N/m
d.
500 N/m
Hint
7.
In Figure 16-6, if the candle were moved so that it was
d
/2 to the right of the screen, but the lamp was not moved, how would the luminous intensity of the lamp have to be adjusted to make each side of the screen equally illuminated?
a.
It would need to be quadrupled.
b.
It would need to be doubled.
c.
It would need to be quartered.
d.
It would need to be halved.
Hint
8.
A __________ image is formed when light rays converge and pass through the image.
a.
virtual
b.
critical
c.
real
d.
convex
Hint
9.
Which of the following statements is true?
a.
Weight is the measure of the amount of matter in an object.
b.
Weight is a measure of inertia.
c.
Weight can change when acceleration due to gravity changes.
d.
Mass is a force.
Hint
10.
A(n) __________ is a line perpendicular to a reflective surface.
a.
normal
b.
reflection
c.
incidence
d.
angle
Hint
11.
According to Figure 1-16, if a mass of 45.0 g were hung on the spring, how long would the spring be?
a.
17.3 cm
b.
46.1 cm
c.
3.6 cm
d.
576 cm
Hint
12.
Which statement about the light rays in Figure 17-5 is true?
a.
The image of the bird creates light rays.
b.
The light originates from the boy's eyes.
c.
The light originates from the bird.
d.
The light originates from the bird's image.
Hint
13.
When two dyes are mixed together, they make a black dye. These pigments are __________.
a.
black and white
b.
secondary
c.
primary
d.
complementary
Hint
14.
In Figure 14-4, if you quadrupled the length of the string, what effect, if any, would it have on its period?
a.
The period would be quadrupled.
b.
The period would be doubled.
c.
The period would be halved.
d.
It would have no effect.
Hint
15.
You accidentally throw your car keys horizontally at 5.0 m/s from a cliff 45 m high. How far from the base of the cliff should you look for your keys?
a.
135 m
b.
225 m
c.
15 m
d.
45 m
Hint
16.
A ray of light travels in a __________.
a.
straight line
b.
circle
c.
back-and-forth motion
d.
curved line
Hint
17.
A polarizer and analyzer will block all light if they are at __________ to each other.
a.
right angles
b.
30° angles
c.
180° angles
d.
parallel angles
Hint
18.
A pulse traveling along a bullwhip is an example of a __________ wave.
a.
compressional
b.
longitudinal
c.
transverse
d.
surface
Hint
19.
How do you calculate your weight in newtons?
a.
2π(
m
)
b.
(9.80 m/s
2
)sin
θ
c.
(9.80 m/s
2
)(
m
)
d.
Hint
20.
A __________ wave bounces off a boundary.
a.
surface
b.
incident
c.
transverse
d.
reflected
Hint
