Question 1

A sound wave radiates from a source in all directions.If the power of the sound source is 200 watts,then the intensity of the sound wave 100 m from the source is

Accepted Answer

A)  2.2 milliWatts/m2. 
B)  2.0 milliWatts/m2. 
C)  1.8 milliWatts/m2. 
D)  1.6 milliWatts/m2. 
E)  1.2 milliWatts/m2. 
A)  2.2 milliWatts/m2. 
B)  2.0 milliWatts/m2. 
C)  1.8 milliWatts/m2. 
D)  1.6 milliWatts/m2. 
E)  1.2 milliWatts/m2.

Question 2

An organ pipe is open at one end and closed at the other.The frequency of the third mode is 300 Hz higher than the frequency of the second mode.If the speed of sound is 345 m/s,then what is the length of the organ pipe?

Accepted Answer

A)  50.3 cm 
B)  57.5 cm 
C)  64.5 cm 
D)  66.7 cm 
E)  70.5 cm 
A)  50.3 cm 
B)  57.5 cm 
C)  64.5 cm 
D)  66.7 cm 
E)  70.5 cm

Question 3

The velocity of shear waves in a long brass rod is 2,033 m/s.If the density of brass is 8,470 kg/m3,then what is the shear modulus of brass?

Accepted Answer

A)  2.70 $\times$ 1010 N/m2 
B)  3.10 $\times$ 1010 N/m2 
C)  3.50 $\times$ 1010 N/m2 
D)  4.10 $\times$ 1010 N/m2 
E)  4.70 $\times$ 1010 N/m2 
A)  2.70 $\times$ 1010 N/m2 
B)  3.10 $\times$ 1010 N/m2 
C)  3.50 $\times$ 1010 N/m2 
D)  4.10 $\times$ 1010 N/m2 
E)  4.70 $\times$ 1010 N/m2

Question 4

An organ pipe is open at both ends.The frequency of the fourth mode is 316 Hz higher than the frequency of the third mode.If the speed of sound is 340 m/s,then what is the length of the organ pipe?

Accepted Answer

A)  53.8 cm 
B)  59.8 cm 
C)  60.3 cm 
D)  62.8 cm 
E)  64.7 cm 
A)  53.8 cm 
B)  59.8 cm 
C)  60.3 cm 
D)  62.8 cm 
E)  64.7 cm

Question 5

An organ pipe is 80.0 cm long and is open at one end and closed at the other.The frequency of the third mode is 200 Hz higher than the frequency of the second mode.What is the velocity of sound?

Accepted Answer

A)  300 m/s 
B)  320 m/s 
C)  340 m/s 
D)  360 m/s 
E)  380 m/s 
A)  300 m/s 
B)  320 m/s 
C)  340 m/s 
D)  360 m/s 
E)  380 m/s

Question 6

A 60.0 cm long organ pipe is filled with air at 15$^{\circ}$C and is open at both ends.The velocity of sound in air at 0.000$^{\circ}$C is 331 m/s.Another 60.0 cm long organ pipe is filled with air at 25.0$^{\circ}$C and is open at both ends.What is the beat frequency between the second modes of the two organ pipes?

Accepted Answer

A)  9.20 Hz 
B)  9.33 Hz 
C)  9.54 Hz 
D)  9.75 Hz 
E)  9.99 Hz 
A)  9.20 Hz 
B)  9.33 Hz 
C)  9.54 Hz 
D)  9.75 Hz 
E)  9.99 Hz

Question 7

A 3.00 m organ pipe is open at both ends and contains air.The velocity of sound in air is 331 m/s.What is the frequency of the lowest frequency mode?

Accepted Answer

A)  39.5 Hz 
B)  40.2 Hz 
C)  43.1 Hz 
D)  47.5 Hz 
E)  55.2 Hz 
A)  39.5 Hz 
B)  40.2 Hz 
C)  43.1 Hz 
D)  47.5 Hz 
E)  55.2 Hz

Question 8

An ambulance is generating a siren sound at a frequency of 2,400 Hz.The velocity of sound is 345.0 m/s.If the ambulance is traveling at a velocity of 24.00 m/s away from the stationary observer,then what is the frequency of the siren perceived by the observer?

Accepted Answer

A)  2,375 Hz 
B)  2,306 Hz 
C)  2,266 Hz 
D)  2,244 Hz 
E)  2,210 Hz 
A)  2,375 Hz 
B)  2,306 Hz 
C)  2,266 Hz 
D)  2,244 Hz 
E)  2,210 Hz

Question 9

A string with a mass per length of 2.00 gm/m is stretched with a force of 120 N between two points that are 0.400 m apart.The fundamental frequency of the stretched string is in tune with the fundamental frequency of an organ pipe filled with air and open at both ends.The velocity of sound in air at 0$^{\circ}$C is 331 m/s.What is the length of the organ pipe?

Accepted Answer

A)  54.1 cm 
B)  59.0 cm 
C)  61.5 cm 
D)  63.5 cm 
E)  66.8 cm 
A)  54.1 cm 
B)  59.0 cm 
C)  61.5 cm 
D)  63.5 cm 
E)  66.8 cm

Question 10

A string with a mass per length of 2.00 gm/m is stretched with a force of 120 N between two points that are 0.400 m apart.The fundamental frequency of the stretched string is in tune with the frequency of the second mode of an organ pipe filled with air and open at both ends.The velocity of sound in air at 0$^{\circ}$C is 331 m/s.What is the length of the organ pipe?

Accepted Answer

A)  225 cm 
B)  175 cm 
C)  125 cm 
D)  108 cm 
E)  95.0 cm 
A)  225 cm 
B)  175 cm 
C)  125 cm 
D)  108 cm 
E)  95.0 cm

Question 11

The speed of sound in water is 4.3 times the speed of sound in air.A whistle produces a sound wave in air with a frequency f0.When this sound wave enters the water,its frequency becomes

Accepted Answer

A)  4.3 f0. 
B)  f0. 
C)  f0/4.3. 
D)  not enough information 
A)  4.3 f0. 
B)  f0. 
C)  f0/4.3. 
D)  not enough information

Question 12

A 60.0 cm long organ pipe is filled with air and is open at both ends.The velocity of sound in air at 0$^{\circ}$C is 331 m/s.What is the wavelength of the fundamental mode?

Accepted Answer

A)  115 cm 
B)  120 cm 
C)  131 cm 
D)  142 cm 
E)  167 cm 
A)  115 cm 
B)  120 cm 
C)  131 cm 
D)  142 cm 
E)  167 cm

Question 13

The sound of a band is rated as 60 dB at a distance of 10.0 m.What is the dB sound level of the band when one is 20.0 m from the band?

Accepted Answer

A)  56 dB 
B)  54 dB 
C)  52 dB 
D)  50 dB 
E)  48 dB 
A)  56 dB 
B)  54 dB 
C)  52 dB 
D)  50 dB 
E)  48 dB

Question 14

The sound of a band is rated as 50 dB at a distance of 30.0 m.What is the dB sound level of the band when one is 10.0 m from the band?

Accepted Answer

A)  59.5 dB 
B)  57.3 dB 
C)  55.2 dB 
D)  52.9 dB 
E)  50.1 dB 
A)  59.5 dB 
B)  57.3 dB 
C)  55.2 dB 
D)  52.9 dB 
E)  50.1 dB

Question 15

The Young's modulus of aluminum is 6.90 $\times$ 1010 N/m2.If the density of aluminum is 2,700 kg/m3,then what is the velocity of longitudinal waves along a thin aluminum rod?

Accepted Answer

A)  6,360 m/s 
B)  6,020 m/s 
C)  5,750 m/s 
D)  5,060 m/s 
E)  4,850 m/s 
A)  6,360 m/s 
B)  6,020 m/s 
C)  5,750 m/s 
D)  5,060 m/s 
E)  4,850 m/s

Question 16

A string with a mass per length of 2.00 gm/m is stretched with a force of 150 N between two points that are 0.500 m apart.The fundamental frequency of the stretched string is in tune with the fundamental frequency of an organ pipe filled with air and open at both ends.The velocity of sound in air at 0$^{\circ}$C is 331 m/s.If the temperature of the air increases by 20$^{\circ}$C,then what is the length of the organ pipe?

Accepted Answer

A)  70.5 cm 
B)  62.6 cm 
C)  59.3 cm 
D)  53.8 cm 
E)  50.2 cm 
A)  70.5 cm 
B)  62.6 cm 
C)  59.3 cm 
D)  53.8 cm 
E)  50.2 cm

Question 17

An ambulance is generating a siren sound at a frequency of 2,400 Hz.The velocity of sound is 345.0 m/s.The observer is traveling at a velocity of 24.00 m/s toward the ambulance and the ambulance is traveling at a velocity of 20.00 m/s toward the observer.What is the frequency of the siren perceived by the observer?

Accepted Answer

A)  2,489 Hz 
B)  2,560 Hz 
C)  2,675 Hz 
D)  2,725 Hz 
E)  2,830 Hz 
A)  2,489 Hz 
B)  2,560 Hz 
C)  2,675 Hz 
D)  2,725 Hz 
E)  2,830 Hz

Question 18

A 50.0 cm long organ pipe is filled with air at 10.0$^{\circ}$C and is open at both ends.The velocity of sound in air at 0.00$^{\circ}$C is 331 m/s.Another 50.0 cm long organ pipe is filled with air at 15.0$^{\circ}$C and is open at both ends.What is the beat frequency between the fundamental modes of the two organ pipes?

Accepted Answer

A)  2.96 Hz 
B)  2.45 Hz 
C)  2.10 Hz 
D)  1.94 Hz 
E)  1.77 Hz 
A)  2.96 Hz 
B)  2.45 Hz 
C)  2.10 Hz 
D)  1.94 Hz 
E)  1.77 Hz

Question 19

A 20.0 cm long organ pipe is filled with air and is open at one end and closed at the other.The velocity of sound in air at 0$^{\circ}$C is 331 m/s.What is the frequency of the third mode?

Accepted Answer

A)  2,070 Hz 
B)  2,190 Hz 
C)  2,320 Hz 
D)  2,450 Hz 
E)  2,680 Hz 
A)  2,070 Hz 
B)  2,190 Hz 
C)  2,320 Hz 
D)  2,450 Hz 
E)  2,680 Hz

Question 20

Aluminum has a shear modulus of 2.4 $\times$ 1010 N/m2 and a wave velocity for shear waves of 2,981 m/s.If the velocity of shear waves decreased by 10%,then what is the change in the shear modulus?

Accepted Answer

A)  35% 
B)  30% 
C)  25% 
D)  20% 
E)  15% 
A)  35% 
B)  30% 
C)  25% 
D)  20% 
E)  15%

Exam 12: Sound

A sound wave radiates from a source in all directions.If the power of the sound source is 200 watts,then the intensity of the sound wave 100 m from the source is

An organ pipe is open at one end and closed at the other.The frequency of the third mode is 300 Hz higher than the frequency of the second mode.If the speed of sound is 345 m/s,then what is the length of the organ pipe?

The velocity of shear waves in a long brass rod is 2,033 m/s.If the density of brass is 8,470 kg/m3,then what is the shear modulus of brass?

An organ pipe is open at both ends.The frequency of the fourth mode is 316 Hz higher than the frequency of the third mode.If the speed of sound is 340 m/s,then what is the length of the organ pipe?

An organ pipe is 80.0 cm long and is open at one end and closed at the other.The frequency of the third mode is 200 Hz higher than the frequency of the second mode.What is the velocity of sound?

A 3.00 m organ pipe is open at both ends and contains air.The velocity of sound in air is 331 m/s.What is the frequency of the lowest frequency mode?

An ambulance is generating a siren sound at a frequency of 2,400 Hz.The velocity of sound is 345.0 m/s.If the ambulance is traveling at a velocity of 24.00 m/s away from the stationary observer,then what is the frequency of the siren perceived by the observer?

The speed of sound in water is 4.3 times the speed of sound in air.A whistle produces a sound wave in air with a frequency f0.When this sound wave enters the water,its frequency becomes

A 60.0 cm long organ pipe is filled with air and is open at both ends.The velocity of sound in air at 0 ∘^{\circ}∘ C is 331 m/s.What is the wavelength of the fundamental mode?

The sound of a band is rated as 60 dB at a distance of 10.0 m.What is the dB sound level of the band when one is 20.0 m from the band?

The sound of a band is rated as 50 dB at a distance of 30.0 m.What is the dB sound level of the band when one is 10.0 m from the band?

The Young's modulus of aluminum is 6.90 ×\times× 1010 N/m2.If the density of aluminum is 2,700 kg/m3,then what is the velocity of longitudinal waves along a thin aluminum rod?

A 20.0 cm long organ pipe is filled with air and is open at one end and closed at the other.The velocity of sound in air at 0 ∘^{\circ}∘ C is 331 m/s.What is the frequency of the third mode?

Aluminum has a shear modulus of 2.4 ×\times× 1010 N/m2 and a wave velocity for shear waves of 2,981 m/s.If the velocity of shear waves decreased by 10%,then what is the change in the shear modulus?

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Filters

The velocity of shear waves in a long brass rod is 2,033 m/s.If the density of brass is 8,470 kg/m³,then what is the shear modulus of brass?

The speed of sound in water is 4.3 times the speed of sound in air.A whistle produces a sound wave in air with a frequency f₀.When this sound wave enters the water,its frequency becomes

A 60.0 cm long organ pipe is filled with air and is open at both ends.The velocity of sound in air at 0 $^{\circ}$ C is 331 m/s.What is the wavelength of the fundamental mode?

The Young's modulus of aluminum is 6.90 $\times$ 10¹⁰ N/m².If the density of aluminum is 2,700 kg/m³,then what is the velocity of longitudinal waves along a thin aluminum rod?

A 20.0 cm long organ pipe is filled with air and is open at one end and closed at the other.The velocity of sound in air at 0 $^{\circ}$ C is 331 m/s.What is the frequency of the third mode?

Aluminum has a shear modulus of 2.4 $\times$ 10¹⁰ N/m² and a wave velocity for shear waves of 2,981 m/s.If the velocity of shear waves decreased by 10%,then what is the change in the shear modulus?