Question 1

Organ pipe Y (open at both ends) is twice as long as organ pipe X (open at one end) as shown. The ratio of their fundamental frequencies fX::fY is:

Accepted Answer

A)  1:1 
B)  1:2 
C)  2:1 
D)  1:4 
E)  4:1 
A)  1:1 
B)  1:2 
C)  2:1 
D)  1:4 
E)  4:1 A

Question 2

To produce beats it is necessary to use two waves:

Accepted Answer

A)  traveling in opposite directions 
B)  of slightly different frequencies 
C)  of equal wavelengths 
D)  of equal amplitudes 
E)  whose ratio of frequencies is an integer 
A)  traveling in opposite directions 
B)  of slightly different frequencies 
C)  of equal wavelengths 
D)  of equal amplitudes 
E)  whose ratio of frequencies is an integer B

Question 3

Take the speed of sound to be 340 m/s. A thunder clap is heard about 3 s after the lightning is seen. The source of both light and sound is:

Accepted Answer

A)  moving overhead faster than the speed of sound 
B)  emitting a much higher frequency than is heard 
C)  emitting a much lower frequency than is heard 
D)  about 1000 m away 
E)  much more than 1000 m away 
A)  moving overhead faster than the speed of sound 
B)  emitting a much higher frequency than is heard 
C)  emitting a much lower frequency than is heard 
D)  about 1000 m away 
E)  much more than 1000 m away D

Question 4

The largest number of beats per second will be heard from which pair of tuning forks?

Accepted Answer

A)  200 and 201 Hz 
B)  256 and 260 Hz 
C)  534 and 540 Hz 
D)  763 and 774 Hz 
E)  8420 and 8422 Hz 
A)  200 and 201 Hz 
B)  256 and 260 Hz 
C)  534 and 540 Hz 
D)  763 and 774 Hz 
E)  8420 and 8422 Hz

Question 5

The intensity of a certain sound wave is 6 $\mu$W/cm2. If its intensity is raised by 10 decibels, the new intensity (in $\mu$W/cm2) is:

Accepted Answer

A)  60 
B)  6.6 
C)  6.06 
D)  600 
E)  12 
A)  60 
B)  6.6 
C)  6.06 
D)  600 
E)  12

Question 6

An organ pipe with both ends open is 0.85 m long. Assuming that the speed of sound is 340 m/s, the frequency of the third harmonic of this pipe is:

Accepted Answer

A)  200 Hz 
B)  300 Hz 
C)  400 Hz 
D)  600 Hz 
E)  none of these 
A)  200 Hz 
B)  300 Hz 
C)  400 Hz 
D)  600 Hz 
E)  none of these

Question 7

Two stationary tuning forks (350 and 352 Hz) are struck simultaneously. The resulting sound is observed to:

Accepted Answer

A)  beat with a frequency of 2 beats/s 
B)  beat with a frequency of 351 beats/s 
C)  be loud but not beat 
D)  be Doppler shifted by 2 Hz 
E)  have a frequency of 702 Hz 
A)  beat with a frequency of 2 beats/s 
B)  beat with a frequency of 351 beats/s 
C)  be loud but not beat 
D)  be Doppler shifted by 2 Hz 
E)  have a frequency of 702 Hz

Question 8

A sound wave has a wavelength of 3.0 m. The distance from a compression center to the adjacent rarefaction center is:

Accepted Answer

A)  0.75 m 
B)  1.5 m 
C)  3.0 m 
D)  need to know wave speed 
E)  need to know frequency 
A)  0.75 m 
B)  1.5 m 
C)  3.0 m 
D)  need to know wave speed 
E)  need to know frequency

Question 9

At points is a sound wave where the gas is maximally compressed, the pressure

Accepted Answer

A)  is a maximum 
B)  is a minimum 
C)  is equal to the ambient value 
D)  is greater than the ambient value but less than the maximum 
E)  is less than the ambient value but greater than the minimum 
A)  is a maximum 
B)  is a minimum 
C)  is equal to the ambient value 
D)  is greater than the ambient value but less than the maximum 
E)  is less than the ambient value but greater than the minimum

Question 10

A tuning fork produces sound waves of wavelength $\lambda$ in air. This sound is used to cause resonance in an air column, closed at one end and open at the other. The length of this column CANNOT be:

Accepted Answer

A)  $\lambda$/4 
B)  2$\lambda$/4 
C)  3$\lambda$/4 
D)  5$\lambda$/4 
E)  7$\lambda$/4 
A)  $\lambda$/4 
B)  2$\lambda$/4 
C)  3$\lambda$/4 
D)  5$\lambda$/4 
E)  7$\lambda$/4

Question 11

"Beats" in sound refer to:

Accepted Answer

A)  interference of two waves of the same frequency 
B)  combination of two waves of slightly different frequency 
C)  reversal of phase of reflected wave relative to incident wave 
D)  two media having slightly different sound velocities 
E)  effect of relative motion of source and observer 
A)  interference of two waves of the same frequency 
B)  combination of two waves of slightly different frequency 
C)  reversal of phase of reflected wave relative to incident wave 
D)  two media having slightly different sound velocities 
E)  effect of relative motion of source and observer

Question 12

Two identical tuning forks vibrate at 256 Hz. One of them is then loaded with a drop of wax, after which 6 beats per second are heard. The period of the loaded tuning fork is:

Accepted Answer

A)  0.006 s 
B)  0.005 s 
C)  0.004 s 
D)  0.003 s 
E)  none of these 
A)  0.006 s 
B)  0.005 s 
C)  0.004 s 
D)  0.003 s 
E)  none of these

Question 13

Five organ pipes are described below. Which one has the highest frequency fundamental?

Accepted Answer

A)  A 2.3-m pipe with one end open and the other closed 
B)  A 3.3-m pipe with one end open and the other closed 
C)  A 1.6-m pipe with both ends open 
D)  A 3.0-m pipe with both ends open 
E)  a pipe in which the displacement nodes are 5-m apart 
A)  A 2.3-m pipe with one end open and the other closed 
B)  A 3.3-m pipe with one end open and the other closed 
C)  A 1.6-m pipe with both ends open 
D)  A 3.0-m pipe with both ends open 
E)  a pipe in which the displacement nodes are 5-m apart

Question 14

Two notes are an "octave" apart. The ratio of their frequencies is:

Accepted Answer

A)  8 
B)  10 
C)    
D)  2 
E)    
A)  8 
B)  10 
C)    
D)  2 
E)

Question 15

You are listening to an "A" note played on a violin string. Let the subscript "s" refer to the violin string and "a" refer to the air. Then:

Accepted Answer

A)  fs = fa but $\lambda$s $\neq$$\lambda$a  
B)  fs = fa and $\lambda$s = $\lambda$a 
C)  $\lambda$s = $\lambda$a but fs $\neq$ fa 
D)  $\lambda$s $\neq$$\lambda$a and fs $\neq$ fa 
E)  linear density of string = volume density of air 
A)  fs = fa but $\lambda$s $\neq$$\lambda$a  
B)  fs = fa and $\lambda$s = $\lambda$a 
C)  $\lambda$s = $\lambda$a but fs $\neq$ fa 
D)  $\lambda$s $\neq$$\lambda$a and fs $\neq$ fa 
E)  linear density of string = volume density of air

Question 16

The speed of sound in air is 340 m/s. The shortest air column, closed at one end, which will respond to a 512 Hz tuning fork is approximately:

Accepted Answer

A)  4.2 cm 
B)  9.4 cm 
C)  17 cm 
D)  33 cm 
E)  66 cm 
A)  4.2 cm 
B)  9.4 cm 
C)  17 cm 
D)  33 cm 
E)  66 cm

Question 17

A 200-cm open organ with one end open pipe is in resonance with a sound wave of wavelength 270 cm. The pipe is operating in its:

Accepted Answer

A)  fundamental frequency 
B)  first overtone 
C)  second overtone 
D)  third overtone 
E)  fourth overtone 
A)  fundamental frequency 
B)  first overtone 
C)  second overtone 
D)  third overtone 
E)  fourth overtone

Question 18

A fire whistle emits a tone of 170 Hz. Take the speed of sound in air to be 340 m/s. The wavelength of this sound is about:

Accepted Answer

A)  0.5 m 
B)  1.0 m 
C)  2.0 m 
D)  3.0 m 
E)  340 m 
A)  0.5 m 
B)  1.0 m 
C)  2.0 m 
D)  3.0 m 
E)  340 m

Question 19

Two small identical speakers are connected (in phase) to the same source. The speakers are 3 m apart and at ear level. An observer stands at X, 4 m in front of one speaker as shown. The sound she hears will be most intense if the wavelength is:

Accepted Answer

A)  5 m 
B)  4 m 
C)  3 m 
D)  2 m 
E)  1 m 
A)  5 m 
B)  4 m 
C)  3 m 
D)  2 m 
E)  1 m

Question 20

In order for two sound waves to produce audible beats, it is essential that the two waves have:

Accepted Answer

A)  the same amplitude 
B)  the same frequency 
C)  the same number of overtones 
D)  slightly different amplitudes 
E)  slightly different frequencies 
A)  the same amplitude 
B)  the same frequency 
C)  the same number of overtones 
D)  slightly different amplitudes 
E)  slightly different frequencies

Exam 17: Waves II

Organ pipe Y (open at both ends) is twice as long as organ pipe X (open at one end) as shown. The ratio of their fundamental frequencies fX::fY is:

To produce beats it is necessary to use two waves:

Take the speed of sound to be 340 m/s. A thunder clap is heard about 3 s after the lightning is seen. The source of both light and sound is:

The largest number of beats per second will be heard from which pair of tuning forks?

The intensity of a certain sound wave is 6 μ\muμ W/cm2. If its intensity is raised by 10 decibels, the new intensity (in μ\muμ W/cm2) is:

An organ pipe with both ends open is 0.85 m long. Assuming that the speed of sound is 340 m/s, the frequency of the third harmonic of this pipe is:

Two stationary tuning forks (350 and 352 Hz) are struck simultaneously. The resulting sound is observed to:

A sound wave has a wavelength of 3.0 m. The distance from a compression center to the adjacent rarefaction center is:

At points is a sound wave where the gas is maximally compressed, the pressure

A tuning fork produces sound waves of wavelength λ\lambdaλ in air. This sound is used to cause resonance in an air column, closed at one end and open at the other. The length of this column CANNOT be:

"Beats" in sound refer to:

Two identical tuning forks vibrate at 256 Hz. One of them is then loaded with a drop of wax, after which 6 beats per second are heard. The period of the loaded tuning fork is:

Five organ pipes are described below. Which one has the highest frequency fundamental?

Two notes are an "octave" apart. The ratio of their frequencies is:

You are listening to an "A" note played on a violin string. Let the subscript "s" refer to the violin string and "a" refer to the air. Then:

The speed of sound in air is 340 m/s. The shortest air column, closed at one end, which will respond to a 512 Hz tuning fork is approximately:

A 200-cm open organ with one end open pipe is in resonance with a sound wave of wavelength 270 cm. The pipe is operating in its:

A fire whistle emits a tone of 170 Hz. Take the speed of sound in air to be 340 m/s. The wavelength of this sound is about:

Two small identical speakers are connected (in phase) to the same source. The speakers are 3 m apart and at ear level. An observer stands at X, 4 m in front of one speaker as shown. The sound she hears will be most intense if the wavelength is:

In order for two sound waves to produce audible beats, it is essential that the two waves have:

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Organ pipe Y (open at both ends) is twice as long as organ pipe X (open at one end) as shown. The ratio of their fundamental frequencies f_X::f_Y is:

The intensity of a certain sound wave is 6 $\mu$ W/cm². If its intensity is raised by 10 decibels, the new intensity (in $\mu$ W/cm²) is:

A tuning fork produces sound waves of wavelength $\lambda$ in air. This sound is used to cause resonance in an air column, closed at one end and open at the other. The length of this column CANNOT be: