Question 1

You see lightning flash followed 8.2 seconds later by the sound of thunder.The ambient air temperature is 12$^{\circ}$C.Approximately how far are you from the lightning?

Accepted Answer

A)  1.26 miles 
B)  1.64 miles 
C)  1.69 miles 
D)  1.32 miles 
A)  1.26 miles 
B)  1.64 miles 
C)  1.69 miles 
D)  1.32 miles

Question 2

The velocity of longitudinal waves in a long brass rod is 3,260 m/s.If the density of brass is 8,470 kg/m3,then what is the tensile modulus of brass?

Accepted Answer

A)  9.80 $\times$ 1010 N/m2 
B)  9.00 $\times$ 1010 N/m2 
C)  8.70 $\times$ 1010 N/m2 
D)  8.50 $\times$ 1010 N/m2 
E)  8.10 $\times$ 1010 N/m2 
A)  9.80 $\times$ 1010 N/m2 
B)  9.00 $\times$ 1010 N/m2 
C)  8.70 $\times$ 1010 N/m2 
D)  8.50 $\times$ 1010 N/m2 
E)  8.10 $\times$ 1010 N/m2

Question 3

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.If the temperature of the air decreases by 20$^{\circ}$C,then what is the length of the organ pipe?

Accepted Answer

A)  75.0 cm 
B)  100 cm 
C)  125 cm 
D)  150 cm 
E)  175 cm 
A)  75.0 cm 
B)  100 cm 
C)  125 cm 
D)  150 cm 
E)  175 cm

Question 4

A 40.0 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.If the temperature of the air decreases by 10$^{\circ}$C,then what is the frequency of the fundamental mode?

Accepted Answer

A)  394 Hz 
B)  406 Hz 
C)  462 Hz 
D)  506 Hz 
E)  544 Hz 
A)  394 Hz 
B)  406 Hz 
C)  462 Hz 
D)  506 Hz 
E)  544 Hz

Question 5

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 24.00 m/s away the observer.What is the frequency of the siren perceived by the observer?

Accepted Answer

A)  2,448 Hz 
B)  2,424 Hz 
C)  2,400 Hz 
D)  2,376 Hz 
E)  2,352 Hz 
A)  2,448 Hz 
B)  2,424 Hz 
C)  2,400 Hz 
D)  2,376 Hz 
E)  2,352 Hz

Question 6

The bulk modulus of water is 0.210 $\times$ 1010 N/m2 and the density is 1000 kg/m3.The velocity of sound in water is

Accepted Answer

A)  1,450 m/s. 
B)  2,150 m/s. 
C)  2,490 m/s. 
D)  2,750 m/s. 
E)  3,100 m/s. 
A)  1,450 m/s. 
B)  2,150 m/s. 
C)  2,490 m/s. 
D)  2,750 m/s. 
E)  3,100 m/s.

Question 7

A 30 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 wavelength of the third mode?

Accepted Answer

A)  48 cm 
B)  36 cm 
C)  30 cm 
D)  24 cm 
E)  12 cm 
A)  48 cm 
B)  36 cm 
C)  30 cm 
D)  24 cm 
E)  12 cm

Question 8

A 20 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 wavelength of the fundamental mode?

Accepted Answer

A)  40 cm 
B)  60 cm 
C)  80 cm 
D)  43 cm 
E)  75 cm 
A)  40 cm 
B)  60 cm 
C)  80 cm 
D)  43 cm 
E)  75 cm

Question 9

A 25.0 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 fifth mode?

Accepted Answer

A)  1,550 Hz 
B)  1,750 Hz 
C)  2,320 Hz 
D)  2,720 Hz 
E)  3,170 Hz 
A)  1,550 Hz 
B)  1,750 Hz 
C)  2,320 Hz 
D)  2,720 Hz 
E)  3,170 Hz

Question 10

A bat is flying toward a cave wall.If it hears reflected sound of frequency 60.9 kHz,what is its flying speed,assuming it emits sound at 52.0 kHz? The speed of sound is 341.5 m/s.

Accepted Answer

A)  25.9 m/s 
B)  28.1 m/s 
C)  49.9 m/s 
D)  26.9 m/s 
E)  58.4 m/s 
A)  25.9 m/s 
B)  28.1 m/s 
C)  49.9 m/s 
D)  26.9 m/s 
E)  58.4 m/s

Question 11

Brass has a shear modulus of 3.400 $\times$ 109 N/m2 and a density of 8.470 $\times$ 103 kg/m3.What is the velocity of shear waves in brass?

Accepted Answer

A)  2,560 m/s 
B)  2,239 m/s 
C)  2,003 m/s 
D)  1,981 m/s 
E)  1,755 m/s 
A)  2,560 m/s 
B)  2,239 m/s 
C)  2,003 m/s 
D)  1,981 m/s 
E)  1,755 m/s

Question 12

An ambulance is generating a siren sound at a frequency of 2,400 Hz.The velocity of sound is 34.0 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 24.00 m/s toward the observer.What is the frequency of the siren perceived by the observer?

Accepted Answer

A)  2,100 Hz 
B)  2,250 Hz 
C)  2,430 Hz 
D)  2,550 Hz 
E)  2,759 Hz 
A)  2,100 Hz 
B)  2,250 Hz 
C)  2,430 Hz 
D)  2,550 Hz 
E)  2,759 Hz

Question 13

A 30 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 wavelength of the fundamental mode?

Accepted Answer

A)  1.4 m 
B)  1.6 m 
C)  1.8 m 
D)  1.0 m 
E)  1.2 m 
A)  1.4 m 
B)  1.6 m 
C)  1.8 m 
D)  1.0 m 
E)  1.2 m

Question 14

The velocity of bulk sound waves in brass is 2,813 m/s.If the density of brass is 8,470 kg/m3,then what is the bulk modulus of brass?

Accepted Answer

A)  5.30 $\times$ 1010 N/m2 
B)  5.80 $\times$ 1010 N/m2 
C)  6.10 $\times$ 1010 N/m2 
D)  6.70 $\times$ 1010 N/m2 
E)  7.50 $\times$ 1010 N/m2 
A)  5.30 $\times$ 1010 N/m2 
B)  5.80 $\times$ 1010 N/m2 
C)  6.10 $\times$ 1010 N/m2 
D)  6.70 $\times$ 1010 N/m2 
E)  7.50 $\times$ 1010 N/m2

Question 15

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 frequency of the second mode 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)  43.6 cm 
B)  40.1 cm 
C)  37.5 cm 
D)  35.6 cm 
E)  30.2 cm 
A)  43.6 cm 
B)  40.1 cm 
C)  37.5 cm 
D)  35.6 cm 
E)  30.2 cm

Question 16

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 observer is traveling at a velocity of 24.00 m/s away from the stationary ambulance,then what is the frequency of the siren perceived by the observer?

Accepted Answer

A)  2,375 Hz 
B)  2,366 Hz 
C)  2,305 Hz 
D)  2,275 Hz 
E)  2,233 Hz 
A)  2,375 Hz 
B)  2,366 Hz 
C)  2,305 Hz 
D)  2,275 Hz 
E)  2,233 Hz

Question 17

A 40.0 cm long organ pipe is filled with air at 0$^{\circ}$C and is open at both ends.The velocity of sound in air at 0$^{\circ}$C is 331 m/s.Another 40.0 cm long organ pipe is filled with air at 20$^{\circ}$C and is open at both ends.What is the beat frequency between the fundamental modes of the two organ pipes?

Accepted Answer

A)  20.5 Hz 
B)  17.5 Hz 
C)  15.6 Hz 
D)  14.9 Hz 
E)  12.3 Hz 
A)  20.5 Hz 
B)  17.5 Hz 
C)  15.6 Hz 
D)  14.9 Hz 
E)  12.3 Hz

Question 18

An ambulance is generating a siren sound at a frequency of 2,000 Hz.The velocity of sound is 345.0 m/s.The observer and the ambulance are traveling toward each other at a velocity of 24.00 m/s.If the observer is stationary,what is the frequency of the siren perceived by the observer?

Accepted Answer

A)  2,032 Hz 
B)  2,150 Hz 
C)  2,220 Hz 
D)  2,575 Hz 
E)  2,750 Hz 
A)  2,032 Hz 
B)  2,150 Hz 
C)  2,220 Hz 
D)  2,575 Hz 
E)  2,750 Hz

Question 19

Lead has a shear modulus of 5.40 $\times$ 109 N/m2 and a density of 11.3 $\times$ 103 kg/m3.What is the velocity of shear waves in lead?

Accepted Answer

A)  691 m/s 
B)  621 m/s 
C)  575 m/s 
D)  521 m/s 
E)  487 m/s 
A)  691 m/s 
B)  621 m/s 
C)  575 m/s 
D)  521 m/s 
E)  487 m/s

Question 20

An organ pipe is open at both ends.The frequency of the third mode is 320 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)  64.0 cm 
B)  62.6 cm 
C)  57.9 cm 
D)  53.9 cm 
E)  50.3 cm 
A)  64.0 cm 
B)  62.6 cm 
C)  57.9 cm 
D)  53.9 cm 
E)  50.3 cm

Exam 12: Sound

You see lightning flash followed 8.2 seconds later by the sound of thunder.The ambient air temperature is 12 ∘^{\circ}∘ C.Approximately how far are you from the lightning?

The velocity of longitudinal waves in a long brass rod is 3,260 m/s.If the density of brass is 8,470 kg/m3,then what is the tensile modulus of brass?

A 40.0 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.If the temperature of the air decreases by 10 ∘^{\circ}∘ C,then what is the frequency of the fundamental mode?

The bulk modulus of water is 0.210 ×\times× 1010 N/m2 and the density is 1000 kg/m3.The velocity of sound in water is

A 30 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 wavelength of the third mode?

A 20 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 wavelength of the fundamental mode?

A 25.0 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 fifth mode?

A bat is flying toward a cave wall.If it hears reflected sound of frequency 60.9 kHz,what is its flying speed,assuming it emits sound at 52.0 kHz? The speed of sound is 341.5 m/s.

Brass has a shear modulus of 3.400 ×\times× 109 N/m2 and a density of 8.470 ×\times× 103 kg/m3.What is the velocity of shear waves in brass?

A 30 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 wavelength of the fundamental mode?

The velocity of bulk sound waves in brass is 2,813 m/s.If the density of brass is 8,470 kg/m3,then what is the bulk modulus of brass?

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 observer is traveling at a velocity of 24.00 m/s away from the stationary ambulance,then what is the frequency of the siren perceived by the observer?

An ambulance is generating a siren sound at a frequency of 2,000 Hz.The velocity of sound is 345.0 m/s.The observer and the ambulance are traveling toward each other at a velocity of 24.00 m/s.If the observer is stationary,what is the frequency of the siren perceived by the observer?

Lead has a shear modulus of 5.40 ×\times× 109 N/m2 and a density of 11.3 ×\times× 103 kg/m3.What is the velocity of shear waves in lead?

An organ pipe is open at both ends.The frequency of the third mode is 320 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?

Introduction

Force

Acceleration and Newtons Second Law of Motion

Motion With Constant Acceleration

Circular Motion

Conservation of Energy

Linear Momentum

Torque and Angular Momentum

Fluids

Elasticity and Oscillations

Waves

Temperature and the Ideal Gas

Heat

Thermodynamics

Electric Forces and Fields

Electric Potential

Electric Current and Circuits

Magnetic Forces and Fields

Electromagnetic Induction

Alternating Current

Electromagnetic Waves

Reflection and Refraction of Light

Optical Instruments

Interference and Diffraction

Relativity

Early Quantum Physics and the Photon

Quantum Physics

Nuclear Physics

Particle Physics

Filters

You see lightning flash followed 8.2 seconds later by the sound of thunder.The ambient air temperature is 12 $^{\circ}$ C.Approximately how far are you from the lightning?

The velocity of longitudinal waves in a long brass rod is 3,260 m/s.If the density of brass is 8,470 kg/m³,then what is the tensile modulus of brass?

A 40.0 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.If the temperature of the air decreases by 10 $^{\circ}$ C,then what is the frequency of the fundamental mode?

The bulk modulus of water is 0.210 $\times$ 10¹⁰ N/m² and the density is 1000 kg/m³.The velocity of sound in water is

A 30 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 wavelength of the third mode?

A 20 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 wavelength of the fundamental mode?

A 25.0 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 fifth mode?

Brass has a shear modulus of 3.400 $\times$ 10⁹ N/m² and a density of 8.470 $\times$ 10³ kg/m³.What is the velocity of shear waves in brass?

A 30 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 wavelength of the fundamental mode?

The velocity of bulk sound waves in brass is 2,813 m/s.If the density of brass is 8,470 kg/m³,then what is the bulk modulus of brass?

Lead has a shear modulus of 5.40 $\times$ 10⁹ N/m² and a density of 11.3 $\times$ 10³ kg/m³.What is the velocity of shear waves in lead?