1. An object moves with simple harmonic motion
An object moves with simple harmonic motion. If the amplitude and the period are both doubled, the object’s maximum speed is
quartered.
halved.
unchanged.
doubled.
quadrupled.
STT14.1
Answer: C

2. An object moves with simple harmonic motion
An object moves with simple harmonic motion. If the amplitude and the period are both doubled, the object’s maximum speed is
quartered.
halved.
unchanged.
doubled.
quadrupled.
STT14.1

3. The figure shows four oscillators at t = 0
The figure shows four oscillators at t = 0. Which one has the phase constant
STT14.2
Answer: D

4. The figure shows four oscillators at t = 0
The figure shows four oscillators at t = 0. Which one has the phase constant
STT14.2

5. Four springs have been compressed from their equilibrium position at x = 0 cm. When released, they will start to oscillate. Rank in order, from highest to lowest, the maximum speeds of the oscillations.
c > b > a > d
c > b > a = d
a = d > b > c
d > a > b > c
b > c > a = d
STT14.3
Answer: B

6. Four springs have been compressed from their equilibrium position at x = 0 cm. When released, they will start to oscillate. Rank in order, from highest to lowest, the maximum speeds of the oscillations.
c > b > a > d
c > b > a = d
a = d > b > c
d > a > b > c
b > c > a = d
STT14.3

7. Velocity is zero; force is to the right.
This is the position graph of a mass on a spring. What can you say about the velocity and the force at the instant indicated by the dotted line?
Velocity is zero; force is to the right.
Velocity is zero; force is to the left.
Velocity is negative; force is to the left.
Velocity is negative; force is to the right.
Velocity is positive; force is to the right.
STT14.4
Answer: A

8. Velocity is zero; force is to the right.
This is the position graph of a mass on a spring. What can you say about the velocity and the force at the instant indicated by the dotted line?
Velocity is zero; force is to the right.
Velocity is zero; force is to the left.
Velocity is negative; force is to the left.
Velocity is negative; force is to the right.
Velocity is positive; force is to the right.
STT14.4

9. One person swings on a swing and finds that the period is 3. 0 s
One person swings on a swing and finds that the period is 3.0 s. Then a second person of equal mass joins him. With two people swinging, the period is
6.0 s.
>3.0 s but not necessarily 6.0 s.
3.0 s.
<3.0 s but not necessarily 1.5 s.
1.5 s.
STT14.5
Answer: C

10. One person swings on a swing and finds that the period is 3. 0 s
One person swings on a swing and finds that the period is 3.0 s. Then a second person of equal mass joins him. With two people swinging, the period is
6.0 s.
>3.0 s but not necessarily 6.0 s.
3.0 s.
<3.0 s but not necessarily 1.5 s.
1.5 s.
STT14.5

11. Rank in order, from largest to smallest, the time constants τa – τd of the decays shown in the figure.
STT14.6
Answer: D

12. Rank in order, from largest to smallest, the time constants τa – τd of the decays shown in the figure.
STT14.6

13. Which of the following actions would make a pulse travel faster down a stretched string?
Use a heavier string of the same length, under the same tension.
Use a lighter string of the same length, under the same tension.
Move your hand up and down more quickly as you generate the pulse.
Move your hand up and down a larger distance as you generate the pulse.
Use a longer string of the same thickness, density, and tension.
Answer: B

14. Which of the following actions would make a pulse travel faster down a stretched string?
Use a heavier string of the same length, under the same tension.
Use a lighter string of the same length, under the same tension.
Move your hand up and down more quickly as you generate the pulse.
Move your hand up and down a larger distance as you generate the pulse.
Use a longer string of the same thickness, density, and tension.
Answer: B

15. The graph at the top is the history graph at x = 4 m of a wave traveling to the right at a speed of 2 m/s. Which is the history graph of this wave at x = 0 m?
Answer: B

16. The graph at the top is the history graph at x = 4 m of a wave traveling to the right at a speed of 2 m/s. Which is the history graph of this wave at x = 0 m?
STT20.1

17. What is the frequency of this traveling wave?
0.1 Hz
0.2 Hz
2 Hz
5 Hz
10 Hz
Answer: D

18. What is the frequency of this traveling wave?
0.1 Hz
0.2 Hz
2 Hz
5 Hz
10 Hz
Answer: D

19. What is the phase difference between the crest of a wave and the adjacent trough?π
π /4
π /2
3 π /2
Answer: B

20. What is the phase difference between the crest of a wave and the adjacent trough?π
π /4
π /2
3 π /2
Answer: B

21. A light wave travels through three transparent materials of equal thickness. Rank in order, from the largest to smallest, the indices of refraction n1, n2, and n3.
n1 > n2 > n3
n2 > n1 > n3
n3 > n1 > n2
n3 > n2 > n1
n1 = n2 = n3
Answer: C

22. A light wave travels through three transparent materials of equal thickness. Rank in order, from the largest to smallest, the indices of refraction n1, n2, and n3.
n1 > n2 > n3
n2 > n1 > n3
n3 > n1 > n2
n3 > n2 > n1
n1 = n2 = n3
Answer: C

23. Four trumpet players are playing the same note
Four trumpet players are playing the same note. If three of them suddenly stop, the sound intensity level decreases by
4 dB
6 dB
12 dB
40 dB
Answer: B

24. Four trumpet players are playing the same note
Four trumpet players are playing the same note. If three of them suddenly stop, the sound intensity level decreases by
4 dB
6 dB
12 dB
40 dB
Answer: B

25. Amy and Zack are both listening to the source of sound waves that is moving to the right. Compare the frequencies each hears.
Answer: B
fAmy > fZack
fAmy < fZack
fAmy = fZack

26. Amy and Zack are both listening to the source of sound waves that is moving to the right. Compare the frequencies each hears.
Answer: B
fAmy > fZack
fAmy < fZack
fAmy = fZack

27. Two pulses on a string approach each other at speeds of 1 m/s
Two pulses on a string approach each other at speeds of 1 m/s. What is the shape of the string at t = 6 s?
IG20.1
Answer: C

28. Two pulses on a string approach each other at speeds of 1 m/s
Two pulses on a string approach each other at speeds of 1 m/s. What is the shape of the string at t = 6 s?
IG20.1

29. A standing wave on a string vibrates as shown at the top
A standing wave on a string vibrates as shown at the top. Suppose the tension is quadrupled while the frequency and the length of the string are held constant. Which standing wave pattern is produced?
STT21.2
Answer: A

30. A standing wave on a string vibrates as shown at the top
A standing wave on a string vibrates as shown at the top. Suppose the tension is quadrupled while the frequency and the length of the string are held constant. Which standing wave pattern is produced?
STT21.2

31. An open-open tube of air supports standing waves at frequencies of 300 Hz and 400 Hz, and at no frequencies between these two. The second harmonic of this tube has frequency
800 Hz.
200 Hz.
600 Hz.
400 Hz.
100 Hz.
STT21.3
Answer: B

32. An open-open tube of air supports standing waves at frequencies of 300 Hz and 400 Hz, and at no frequencies between these two. The second harmonic of this tube has frequency
800 Hz.
200 Hz.
600 Hz.
400 Hz.
100 Hz.
STT21.3

33. Move speaker 1 forward (to the right) 0.5 m.
Two loudspeakers emit waves with l = 2.0 m. Speaker 2 is 1.0 m in front of speaker 1. What, if anything, must be done to cause constructive interference between the two waves?
Move speaker 1 forward (to the right) 0.5 m.
Move speaker 1 backward (to the left) 1.0 m.
Move speaker 1 forward (to the right) 1.0 m.
Move speaker 1 backward (to the left) 0.5 m.
Nothing. The situation shown already causes constructive interference.
STT21.4
Answer: D

34. Move speaker 1 forward (to the right) 0.5 m.
Two loudspeakers emit waves with l = 2.0 m. Speaker 2 is 1.0 m in front of speaker 1. What, if anything, must be done to cause constructive interference between the two waves?
Move speaker 1 forward (to the right) 0.5 m.
Move speaker 1 backward (to the left) 1.0 m.
Move speaker 1 forward (to the right) 1.0 m.
Move speaker 1 backward (to the left) 0.5 m.
Nothing. The situation shown already causes constructive interference.
STT21.4

35. The interference at point C in the figure at the right is
maximum constructive.
destructive, but not perfect.
constructive, but less than maximum.
perfect destructive.
there is no interference at point C.
STT21.5
Answer: D

36. The interference at point C in the figure at the right is
maximum constructive.
destructive, but not perfect.
constructive, but less than maximum.
perfect destructive.
there is no interference at point C.
STT21.5

37. These two loudspeakers are in phase
These two loudspeakers are in phase. They emit equal-amplitude sound waves with a wavelength of 1.0 m. At the point indicated, is the interference maximum constructive, perfect destructive or something in between?
STT21.6
Answer: B
perfect destructive
maximum constructive
something in between

38. These two loudspeakers are in phase
These two loudspeakers are in phase. They emit equal-amplitude sound waves with a wavelength of 1.0 m. At the point indicated, is the interference maximum constructive, perfect destructive or something in between?
STT21.6
perfect destructive
maximum constructive
something in between

39. You hear three beats per second when two sound tones are generated
You hear three beats per second when two sound tones are generated. The frequency of one tone is known to be 610 Hz. The frequency of the other is
604 Hz.
607 Hz.
613 Hz.
616 Hz.
Either b or c.
STT21.7
Answer: E

40. You hear three beats per second when two sound tones are generated
You hear three beats per second when two sound tones are generated. The frequency of one tone is known to be 610 Hz. The frequency of the other is
604 Hz.
607 Hz.
613 Hz.
616 Hz.
Either b or c.
STT21.7