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?
A. 1
B. 2
C. 3
D. 4
E. 5
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?
A. 1
B. 2
C. 3
D. 4
E. 5
Why does your voice change pitch when you speak after
inhaling the contents of a helium-filled balloon?
A. The helium decreases the effective length of your vocal
cords, so their fundamental frequency is increased.
B. The helium increases the stiffness of your vocal cords, so
their fundamental frequency is increased.
C. 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.
D. 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.
E. Helium is a lighter gas than air, so the resulting buoyancy
force causes the pitch to rise.
Why does your voice change pitch when you speak after
inhaling the contents of a helium-filled balloon?
A. The helium decreases the effective length of your vocal
cords, so their fundamental frequency is increased.
B. The helium increases the stiffness of your vocal cords, so
their fundamental frequency is increased.
C. 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.
D. 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.
E. Helium is a lighter gas than air, so the resulting buoyancy
force causes the pitch to rise.
The figure represents a string of length L, fixed at
both ends, vibrating in several harmonics. Which
string shows the 4th harmonic?
The figure represents a string of length L, fixed at
both ends, vibrating in several harmonics. Which
string shows the 4th harmonic?
The figure represents a string of length L, fixed at
both ends, vibrating in several harmonics. Which
string shows the 3rd harmonic?
The figure represents a string of length L, fixed at
both ends, vibrating in several harmonics. Which
string shows the 3rd harmonic?
The figure shows several modes of vibration
of a string fixed at both ends. The mode of
vibration that represents the fifth harmonic is
A. 1
B. 2
C. 3
D. 4
E. None of these is correct.
The figure shows several modes of vibration
of a string fixed at both ends. The mode of
vibration that represents the fifth harmonic is
A. 1
B. 2
C. 3
D. 4
E. None of these is correct.
The fundamental frequency of a vibrating string
is f1. If the tension in the string is doubled, the
fundamental frequency becomes
f1
A.
2
f1
B.
2
C. f1
D.
2
f1
E. 2 f1
The fundamental frequency of a vibrating string
is f1. If the tension in the string is doubled, the
fundamental frequency becomes
f1
A.
2
f1
B.
2
C. f1
D.
2
f1
E. 2 f1
The fundamental frequency of a vibrating
string is f1. If the tension in the string is
increased by 50% while the linear density is
held constant, the fundamental frequency
becomes
A. f1
B. 1.2f1
C. 1.5f1
D. 1.7f1
E. 2f1
The fundamental frequency of a vibrating
string is f1. If the tension in the string is
increased by 50% while the linear density is
held constant, the fundamental frequency
becomes
A. f1
B. 1.2f1
C. 1.5f1
D. 1.7f1
E. 2f1
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
A. 1 and 5.
B. 1, 3, and 5.
C. 1 and 3.
D. 2 and 4.
E. 1, 2, 3, 4, and 5.
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
A. 1 and 5.
B. 1, 3, and 5.
C. 1 and 3.
D. 2 and 4.
E. 1, 2, 3, 4, and 5.
A stretched string is fixed at points 1 and 5.
When it is vibrating in its first harmonic
frequency, the nodes are at points
A. 1 and 5 only.
B. 1, 3, and 5.
C. 2 and 4.
D. 2, 3, and 4.
E. 1, 2, 3, 4, and 5.
A stretched string is fixed at points 1 and 5.
When it is vibrating in its first harmonic
frequency, the nodes are at points
A. 1 and 5 only.
B. 1, 3, and 5.
C. 2 and 4.
D. 2, 3, and 4.
E. 1, 2, 3, 4, and 5.
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
A. first harmonic.
B. second harmonic.
C. third harmonic.
D. fourth harmonic.
E. fifth harmonic.
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
A. first harmonic.
B. second harmonic.
C. third harmonic.
D. fourth harmonic.
E. fifth harmonic.
Of the sound sources shown, that which is
vibrating with its first harmonic is
A. the whistle.
B. the organ pipe.
C. the vibrating string.
D. the vibrating rod.
E. None of these.
Of the sound sources shown, that which is
vibrating with its first harmonic is
A. the whistle.
B. the organ pipe.
C. the vibrating string.
D. the vibrating rod.
E. None of these.
Of the sound sources shown, that
which is vibrating with its first
harmonic is the
A.
B.
C.
D.
E.
whistle.
organ pipe.
vibrating string.
vibrating rod.
vibrating spring.
Of the sound sources shown, that
which is vibrating with its first
harmonic is the
A.
B.
C.
D.
E.
whistle.
organ pipe.
vibrating string.
vibrating rod.
vibrating spring.
When an organ pipe, which is closed at one
end only, vibrates with a frequency that is
three times its fundamental (first harmonic)
frequency,
A. the sound produced travels at three times its
former speed.
B. the sound produced is its fifth harmonic.
C. beats are produced.
D. the sound produced has one-third its former
wavelength.
E. the closed end is a displacement antinode.
When an organ pipe, which is closed at one
end only, vibrates with a frequency that is
three times its fundamental (first harmonic)
frequency,
A. the sound produced travels at three times its
former speed.
B. the sound produced is its fifth harmonic.
C. beats are produced.
D. the sound produced has one-third its
former wavelength.
E. the closed end is a displacement antinode.
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
A. 80 m/s
B. 0.16 km/s
C. 0.24 km/s
D. 0.32 km/s
E. 0.96 km/s
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
A. 80 m/s
B. 0.16 km/s
C. 0.24 km/s
D. 0.32 km/s
E. 0.96 km/s
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
A. fundamental.
B. second harmonic.
C. third harmonic.
D. fourth harmonic.
E. fifth harmonic.
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
A. fundamental.
B. second harmonic.
C. third harmonic.
D. fourth harmonic.
E. fifth harmonic.
On a standing-wave pattern, the distance
between two consecutive nodes is d. The
wavelength is
A. d/2
B. d
C. 3d/2
D. 2d
E. 4d
On a standing-wave pattern, the distance
between two consecutive nodes is d. The
wavelength is
A. d/2
B. d
C. 3d/2
D. 2d
E. 4d
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?
A. L/6
B. L/4
C. L/5
D. L/2
E. L/3
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?
A. L/6
B. L/4
C. L/5
D. L/2
E. L/3
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?
A. 768 Hz
B. 1.28 kHz
C. 5.12 kHz
D. 19.7 kHz
E. All of these can be produced.
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?
A. 768 Hz
B. 1.28 kHz
C. 5.12 kHz
D. 19.7 kHz
E. All of these can be produced.
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
A. 64.0 Hz
B. 128 Hz
C. 256 Hz
D. 512 Hz
E. 1.02 kHz
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
A. 64.0 Hz
B. 128 Hz
C. 256 Hz
D. 512 Hz
E. 1.02 kHz
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?
A. 220 m/s
B. 440 m/s
C. 660 m/s
D. 880 m/s
E. 1.10 km/s
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?
A. 220 m/s
B. 440 m/s
C. 660 m/s
D. 880 m/s
E. 1.10 km/s
The sound wave in an organ tube shown
has a wavelength that is equal to the
distance between
A. A and B.
B. A and C.
C. the nodes farthest apart.
D. the antinodes farthest
apart.
E. None of these is correct.
The sound wave in an organ tube shown
has a wavelength that is equal to the
distance between
A. A and B.
B. A and C.
C. the nodes farthest apart.
D. the antinodes farthest
apart.
E. None of these is correct.