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- 1. Multiple Choice
Sketch A shows two identical pulses traveling in opposite directions along a string, each with a speed of 1.0 cm/s. After 4.0 s, the string will look like which of the other sketches?
1
2
3
4
5
- 2. Multiple Choice
Why does your voice change pitch when you speak after inhaling the contents of a helium-filled balloon?
The helium decreases the effective length of your vocal cords, so their fundamental frequency is increased
The helium increases the stiffness of your vocal cords, so their fundamental frequency is increased.
The speed of sound in helium is higher than the speed of sound in air, so the fundamental frequency of your throat and mouth cavity is increased.
The speed of sound in helium is lower than the speed of sound in air, so the frequency of the sound released into the air is increased.
Helium is a lighter gas than air, so the resulting buoyancy force causes the pitch to rise.
- 3. Multiple Choice
The figure represents a string of length L, fixed at both ends, vibrating in several harmonics. Which string shows the 4th harmonic?
A
B
C
D
E
- 4. Multiple Choice
The figure represents a string of length L, fixed at both ends, vibrating in several harmonics. Which string shows the 3rd harmonic?
A
B
C
D
E
- 5. Multiple Choice
The figure shows several modes of vibration of a string fixed at both ends. The mode of vibration that represents the fifth harmonic is
1
2
3
4
None of these is correct.
- 6. Multiple Choice
A stretched string is fixed at points 1 and 5. When it is vibrating at the second harmonic frequency, the nodes of the standing wave are at points
1 and 5.
1, 3, and 5.
1 and 3.
2 and 4.
1, 2, 3, 4, and 5.
- 7. Multiple Choice
A stretched string is fixed at points 1 and 5. When it is vibrating in its first harmonic frequency, the nodes are at points
1 and 5 only.
1, 3, and 5.
2 and 4.
2, 3, and 4.
1, 2, 3, 4, and 5.
- 8. Multiple Choice
The figure shows a standing wave in a pipe that is closed at one end. The frequency associated with this wave pattern is called the
first harmonic.
second harmonic.
third harmonic.
fourth harmonic.
fifth harmonic.
- 9. Multiple Choice
Of the sound sources shown, that which is vibrating with its first harmonic is
the whistle.
the organ pipe.
the vibrating string.
the vibrating rod.
None of these.
- 10. Multiple Choice
Of the sound sources shown, that which is vibrating with its first harmonic is the
whistle.
organ pipe.
vibrating string.
vibrating rod.
vibrating spring.
- 11. Multiple Choice
When an organ pipe, which is closed at one end only, vibrates with a frequency that is three times its fundamental (first harmonic) frequency,
the sound produced travels at three times its former speed.
the sound produced is its fifth harmonic.
beats are produced.
the sound produced has one-third its former wavelength.
the closed end is a displacement antinode.
- 12. Multiple Choice
The air in a closed organ pipe vibrates as shown. The length of the pipe is 3.0 m. The frequency of vibration is 80 Hz. The speed of sound in the pipe is approximately
80 m/s
0.16 km/s
0.24 km/s
0.32 km/s
0.96 km/s
- 13. Multiple Choice
A string fixed at both ends is vibrating in a standing wave. There are three nodes between the ends of the string, not including those on the ends. The string is vibrating at a frequency that is its
fundamental.
second harmonic.
third harmonic.
fourth harmonic.
fifth harmonic.
- 14. Multiple Choice
On a standing-wave pattern, the distance between two consecutive nodes is d. The wavelength is
d/2
d
3/2d
2d
4d
- 15. Multiple Choice
A stretched string of length L, fixed at both ends, is vibrating in its third harmonic. How far from the end of the string can the blade of a screwdriver be placed against the string without disturbing the amplitude of the vibration?
L/6
L/4
L/5
L/2
L/3
- 16. Multiple Choice
In a pipe that is open at one end and closed at the other and that has a fundamental frequency of 256 Hz, which of the following frequencies cannot be produced?
768 Hz
1.28 kHz
5.12 kHz
19.7 kHz
All of these can be produced.
- 17. Multiple Choice
The fundamental frequency of a pipe that has one end closed is 256 Hz. When both ends of the same pipe are opened, the fundamental frequency is
64.0 Hz
128 Hz
256 Hz
512 Hz
1.02 kHz
- 18. Multiple Choice
A 1.00 m string fixed at both ends vibrates in its fundamental mode at 440 Hz. What is the speed of the waves on this string?
220 m/s
440 m/s
660 m/s
880 m/s
1.10 km/s
- 19. Multiple Choice
The sound wave in an organ tube shown has a wavelength that is equal to the distance between
A and B.
A and C.
the nodes farthest apart.
the antinodes farthest apart.
None of these are correct.
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