Question 1

An organ pipe with one end open and the other closed is operating at one of its resonant frequencies.The open and closed ends are respectively:

Accepted Answer

A) pressure node, pressure node 
B) pressure node, displacement node 
C) displacement antinode, pressure node 
D) displacement node, displacement node 
E) pressure antinode, pressure antinode 
A) pressure node, pressure node 
B) pressure node, displacement node 
C) displacement antinode, pressure node 
D) displacement node, displacement node 
E) pressure antinode, pressure antinode

Question 2

If I0 = 10-12 W/m2, and I = 4.5 x 10-8 W/m2, what is log (I/I0)?

Accepted Answer

A) 4.5 x 104 
B) 18 
C) 11 
D) 4.7 
E) 3.7 
A) 4.5 x 104 
B) 18 
C) 11 
D) 4.7 
E) 3.7

Question 3

The rise in pitch of an approaching siren is an apparent increase in its:

Accepted Answer

A) speed 
B) amplitude 
C) frequency 
D) wavelength 
E) number of overtones 
A) speed 
B) amplitude 
C) frequency 
D) wavelength 
E) number of overtones

Question 4

During a time interval of exactly one period of vibration of a tuning fork, the emitted sound travels a distance:

Accepted Answer

A) equal to the length of the tuning fork 
B) equal to twice the length of the tuning fork 
C) of about 330 m 
D) which decreases with time 
E) of one wavelength in air 
A) equal to the length of the tuning fork 
B) equal to twice the length of the tuning fork 
C) of about 330 m 
D) which decreases with time 
E) of one wavelength in air

Question 5

The intensity of a certain sound wave is 6  W/cm2.If its intensity is raised by 10 decibels, the new intensity is:

Accepted Answer

A) 60 $\mu$W/cm2 
B) 6.6 $\mu$W/cm2 
C) 6.06$\mu$W/cm2 
D) 600 $\mu$W/cm2 
E) 12 $\mu$W/cm2 
A) 60 $\mu$W/cm2 
B) 6.6 $\mu$W/cm2 
C) 6.06$\mu$W/cm2 
D) 600 $\mu$W/cm2 
E) 12 $\mu$W/cm2

Question 6

Which of the following properties of a sound wave determine its "pitch"?

Accepted Answer

A) amplitude 
B) distance form source to detector 
C) frequency 
D) phase 
E) speed 
A) amplitude 
B) distance form source to detector 
C) frequency 
D) phase 
E) speed

Question 7

Two identical strings, A and B, have nearly the same tension.When they both vibrate in their fundamental resonant modes, there is a beat of 3 Hz.When string B is tightened slightly, to increase the tension, the beat frequency becomes 6 Hz.This means:

Accepted Answer

A) that before tightening A had a higher frequency than B, but after tightening, B has a higher frequency than A 
B) that before tightening B had a higher frequency than A, but after tightening, A has a higher frequency than B 
C) that before and after tightening A has a higher frequency than B 
D) that before and after tightening B has a higher frequency than A 
E) none of the above 
A) that before tightening A had a higher frequency than B, but after tightening, B has a higher frequency than A 
B) that before tightening B had a higher frequency than A, but after tightening, A has a higher frequency than B 
C) that before and after tightening A has a higher frequency than B 
D) that before and after tightening B has a higher frequency than A 
E) none of the above

Question 8

An organ pipe with one end closed and the other open has length L.Its fundamental frequency is proportional to:

Accepted Answer

A) L 
B) 1/L 
C) 1/L2 
D) L2 
E)    
A) L 
B) 1/L 
C) 1/L2 
D) L2 
E)

Question 9

If the speed of sound is 340 m/s, the two lowest frequencies of an 0.5 m organ pipe, closed at one end, are approximately:

Accepted Answer

A) 170 and 340 Hz 
B) 170 and 510 Hz 
C) 340 and 680 Hz 
D) 340 and 1020 Hz 
E) 57 and 170 Hz 
A) 170 and 340 Hz 
B) 170 and 510 Hz 
C) 340 and 680 Hz 
D) 340 and 1020 Hz 
E) 57 and 170 Hz

Question 10

A plane produces a sonic boom only when:

Accepted Answer

A) its speed changes from being slower than the speed of sound to being faster than the speed of sound 
B) it emits sound waves of high frequency 
C) it flies at high altitudes 
D) it flies on a curved path 
E) it flies faster than the speed of sound 
A) its speed changes from being slower than the speed of sound to being faster than the speed of sound 
B) it emits sound waves of high frequency 
C) it flies at high altitudes 
D) it flies on a curved path 
E) it flies faster than the speed of sound

Question 11

A stationary source generates 5.0 Hz water waves whose speed is 2.0 m/s.A boat is approaching the source at 1.0 m/s.The frequency of these waves, as observed by a person in the boat, is:

Accepted Answer

A) 2.5 Hz 
B) 5.0 Hz 
C) 7.5 Hz 
D) 15 Hz 
E) 30 Hz 
A) 2.5 Hz 
B) 5.0 Hz 
C) 7.5 Hz 
D) 15 Hz 
E) 30 Hz

Question 12

The valves of a trumpet and the slide of a trombone are for the purpose of:

Accepted Answer

A) playing short (staccato)notes 
B) tuning the instruments 
C) changing the harmonic content 
D) changing the length of the air column 
E) producing gradations in loudness 
A) playing short (staccato)notes 
B) tuning the instruments 
C) changing the harmonic content 
D) changing the length of the air column 
E) producing gradations in loudness

Question 13

A stationary source emits a sound wave of frequency f.If it were possible for a man to travel toward the source at the speed of sound, he would observe the emitted sound to have a frequency of:

Accepted Answer

A) 0 
B) f/2 
C) 2f/3 
D) 2f 
E) infinity 
A) 0 
B) f/2 
C) 2f/3 
D) 2f 
E) infinity

Question 14

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)   
B)   
C)   
D)   
E) "linear density of string = volume density of air" 
A)   
B)   
C)   
D)   
E) "linear density of string = volume density of air"

Question 15

Two sound waves are traveling through the same medium.They have the same amplitude, wavelength, and direction of travel.If the phase difference between them is 7π, the type of interference they exhibit is:

Accepted Answer

A) fully constructive 
B) fully destructive 
C) indeterminate 
D) partially constructive 
E) partially destructive 
A) fully constructive 
B) fully destructive 
C) indeterminate 
D) partially constructive 
E) partially destructive

Question 16

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.If the amplitudes are not changed, the sound he hears will be least intense if the wavelength is:

Accepted Answer

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

Question 17

A column of argon is open at one end and closed at the other.The shortest length of such a column that will resonate with a 200 Hz tuning fork is 42.5 cm.The speed of sound in argon must be:

Accepted Answer

A) 85.0 m/s 
B) 170 m/s 
C) 340 m/s 
D) 470 m/s 
E) 940 m/s 
A) 85.0 m/s 
B) 170 m/s 
C) 340 m/s 
D) 470 m/s 
E) 940 m/s

Question 18

A source emits sound with a frequency of 1000 Hz.Both it and an observer are moving in the same direction with the same speed, 100 m/s.If the speed of sound is 340 m/s, the observer hears sound with a frequency of:

Accepted Answer

A) 290 Hz 
B) 540 Hz 
C) 1000 Hz 
D) 1800 Hz 
E) 3400 Hz 
A) 290 Hz 
B) 540 Hz 
C) 1000 Hz 
D) 1800 Hz 
E) 3400 Hz

Question 19

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 20

If the speed of sound is 340 m/s a plane flying at 400 m/s has a Mach number of:

Accepted Answer

A) 0.85 
B) 1.2 
C) 1.4 
D) 1.7 
E) 400 
A) 0.85 
B) 1.2 
C) 1.4 
D) 1.7 
E) 400

Exam 17: Waves

An organ pipe with one end open and the other closed is operating at one of its resonant frequencies.The open and closed ends are respectively:

If I0 = 10-12 W/m2, and I = 4.5 x 10-8 W/m2, what is log (I/I0)?

The rise in pitch of an approaching siren is an apparent increase in its:

During a time interval of exactly one period of vibration of a tuning fork, the emitted sound travels a distance:

The intensity of a certain sound wave is 6 W/cm2.If its intensity is raised by 10 decibels, the new intensity is:

Which of the following properties of a sound wave determine its "pitch"?

Two identical strings, A and B, have nearly the same tension.When they both vibrate in their fundamental resonant modes, there is a beat of 3 Hz.When string B is tightened slightly, to increase the tension, the beat frequency becomes 6 Hz.This means:

An organ pipe with one end closed and the other open has length L.Its fundamental frequency is proportional to:

If the speed of sound is 340 m/s, the two lowest frequencies of an 0.5 m organ pipe, closed at one end, are approximately:

A plane produces a sonic boom only when:

A stationary source generates 5.0 Hz water waves whose speed is 2.0 m/s.A boat is approaching the source at 1.0 m/s.The frequency of these waves, as observed by a person in the boat, is:

The valves of a trumpet and the slide of a trombone are for the purpose of:

A stationary source emits a sound wave of frequency f.If it were possible for a man to travel toward the source at the speed of sound, he would observe the emitted sound to have a frequency of:

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:

Two sound waves are traveling through the same medium.They have the same amplitude, wavelength, and direction of travel.If the phase difference between them is 7π, the type of interference they exhibit is:

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.If the amplitudes are not changed, the sound he hears will be least intense if the wavelength is:

A column of argon is open at one end and closed at the other.The shortest length of such a column that will resonate with a 200 Hz tuning fork is 42.5 cm.The speed of sound in argon must be:

A source emits sound with a frequency of 1000 Hz.Both it and an observer are moving in the same direction with the same speed, 100 m/s.If the speed of sound is 340 m/s, the observer hears sound with a frequency of:

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

If the speed of sound is 340 m/s a plane flying at 400 m/s has a Mach number of:

Measurement

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Filters

If I₀ = 10^-12 W/m², and I = 4.5 x 10^-8 W/m², what is log (I/I₀)?

The intensity of a certain sound wave is 6 W/cm².If its intensity is raised by 10 decibels, the new intensity is: