Name: ________________________ Class: ___________________ Date: __________
ID: A
Exam 4--PHYS 102--S16
Multiple Choice
Identify the choice that best completes the statement or answers the question.
1. Consider this 2-lens system. What is the final magnification?
a.
b.
c.
1
4
+3
0
−
d.
e.
1
2
+2
+
2. Mirrors experience which of these aberrations:
5. An object is placed at a distance of 50 cm from a
lens along the axis. If a real image forms at a
distance of 40 cm from the lens, on the opposite
side from the object, what is the focal length of the
lens?
I. Spherical Aberration
II. Chromatic Aberration
a.
b.
c.
d.
I
II
I & II
neither of these
3. You look at something far away. Then, you look at
something closer. How has the focal length of your
eye lens changed?
a.
b.
c.
d.
a.
b.
c.
d.
f has increased
f has decreased
f remained the same
none of these
90 cm
200 cm
22 cm
45 cm
6. Which of the following best describes the image
for a convex lens that forms whenever the object is
at a distance less than one focal length from the
lens?
a. inverted, diminished and real
b. inverted, enlarged and real
c. upright, diminished and virtual
d. upright, enlarged and virtual
4. Which of the following effects is the result of the
fact that the index of refraction of glass will vary
with wavelength?
a. spherical aberration
b. chromatic aberration
c. light scattering
d. mirages
1
Name: ________________________
ID: A
10. A diffraction grating has 12000 lines/cm. Light of
wavelength 436 nm is incident on the grating. How
many bright spots are on the screen?
7. An object is 6.0 cm from a convex lens along its
axis. The lens has a focal length of 9.0 cm. What
are the respective values of the image distance and
magnification?
a.
b.
c.
d.
a.
b.
c.
d.
q=−18 cm and M=3.0
q=3.0 cm and M=−0.50
q=18 cm and M=3.0
q=−18 cm and M=−3.0
11. This figure shows a double-slit diffraction pattern.
What is the path-length difference of the light rays
that interfere to produce the designated bright
fringe (with the arrow)?
8. Which of these rays is drawn incorrectly?
a.
b.
c.
d.
e.
1
2
3
5
(a)
(b)
(c)
(a) & (c)
(a) & (b)
9. A diffraction grating has 2000 lines/mm. What is
the slit separation?
a. 4.0x10-7 m
b. 2.0x10-7
c. 2.5x10-7 m
d. 5.0x10-7 m
a.
b.
c.
d.
2 wavelengths
2.5 wavelengths
3 wavelengths
3.5 wavelengths
12. In a Young's double-slit interference apparatus, by
what factor is the distance between adjacent light
and dark fringes changed when the separation
between the slits is doubled?
a. 1
b. 2
c. 1/2
d. 1/4
2
Name: ________________________
ID: A
13. A light of wavelength 550 nm illuminates a double
slit. The separation between the slits is 5.2x10 -6 m.
What is the angle to the 2nd order bright fringe?
a.
b.
c.
d.
16. Light of wavelength 610 nm is incident on a slit of
width 0.20 mm and a diffraction pattern is
produced on a screen that is 1.5 m from the slit.
What is the distance of the second dark fringe from
the center of the bright fringe? (1 nm = 10−9 m)
0.02 degrees
12 degrees
8.3 degrees
3.2 degrees
14. By what amount are these two waves out of phase?
a.
b.
c.
d.
0.68 cm
1.2 cm
1.4 cm
0.92 cm
17. The pitch of an individual’s voice is modulated by
changing _________.
a. the mass of the vocal cords
b. the size of the glottis
c. the tension of the vocal cords
d. the length of the vocal cords
a.
b.
c.
d.
e.
18. Consider this figure. What best describes the part
labeled (1)?
0º
45º
90º
180º
360º
15. Two electromagnetic waves have a wavelength of
3.0 m. They are coherent and initially in-phase.
One travels 4.0 meters to a screen. Another travels
2.5 meters to the same point on the screen. On the
screen, you observe...
a. somewhere between a dark and bright spot
b. it depends on the frequency
c. a bright spot
d. a dark spot
a.
b.
c.
d.
e.
3
larynx
trachea
glottis
vocal cords
thyroid
Name: ________________________
ID: A
22. A sound has an intensity level of 24 dB. What is
the intensity of this sound?
19. Consider this diagram for the next set of questions:
a.
b.
c.
d.
e.
Which of these is called the cochlea?
a. (2)
b. (4)
c. (5)
d. (6)
e. (7)
23. Two loudspeakers are in phase and produce a
single tone with a wavelength of 2.0 m. A
microphone is located 8 meters from one of the
speakers and 12 meters from the other speaker.
What will the microphone detect?
a. no sound at all
b. a loud sound
c. a quiet sound
20. 50 db is ____ times as intense as 30 db.
a. 20
b. 1.7
c. 0.6
d. 1500
e. 100
24. Two tones are played on a guitar. One tone is 140
Hz. The other is 143 Hz. What is the frequency of
the beats?
a. 0 Hz
b. 1.02 Hz
c. 3 Hz
d. 140 Hz
21. You stand 1 meter from a speaker and measure the
intensity to be 0.1 W/m 2. How far away should
you stand so that the intensity is 0.001 W/m 2?
a.
b.
c.
d.
2.5x10-10 W/m2
0.38 W/m2
9.1 W/m2
0.0034 W/m2
24 W/m2
3m
10 m
5m
100 m
25. The tension in a guitar string is increased by a
factor of 2. By what factor does the wave velocity
change?
a. 1.4
b. 2.0
c. 0.7
d. 0.5
4
Name: ________________________
ID: A
30. The speed of a wave depends on which of these:
I. Frequency
II. Wavelength
III. Medium
a. I & II
b. I, II, & III
c. III only
d. II & III
e. none of these
26. Consider this standing wave on a string, fixed at
both ends, for the next set of questions:
If the length of the string (l) is 3 m, what is the
wavelength of the standing wave?
a. 6 m
b. 4 m
c. 3 m
d. 2 m
e. 4.5 m
27. For the wave in the previous question, which
harmonic is this?
a. 2nd
b. 3rd
c. 4th
d. 5th
e. 6th
28. If the speed of a wave is 3 m/s and its wavelength
is 0.10 m, what is its period?
a. 0.3 s
b. 0.03 s
c. 0.01 s
d. 0.1 s
e. 30 s
29. Which of these shows the wavelength of this
transverse wave?
a.
b.
c.
d.
A
B
C
D
5
ID: A
Exam 4--PHYS 102--S16
Answer Section
MULTIPLE CHOICE
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