Question 1

A string under tension carries transverse waves traveling at speed v.If the same string is under four times the tension,what is the wave speed?

Accepted Answer

A) v 
B) 2v 
C) v/2 
D) 4v 
E) v/4 
A) v 
B) 2v 
C) v/2 
D) 4v 
E) v/4 B

Question 2

A general rule for estimating the distance in kilometers between you and a lightning bolt is to count the number of seconds between the time you see the flash and the time you hear the thunder and then divide by

Accepted Answer

A) 2 
B) 3 
C) 4 
D) 5 
E) None of these is correct. 
A) 2 
B) 3 
C) 4 
D) 5 
E) None of these is correct. B

Question 3

Which curve best represents the variation of wave velocity with linear density in a vibrating string?

Accepted Answer

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

Question 4

If you were to double the speed of a wave on a string while keeping the frequency and amplitude of the wave constant,the rate at which energy is delivered by the wave would

Accepted Answer

A) double. 
B) quadruple. 
C) be reduced 50%. 
D) be reduced to 25% of its previous value. 
E) be unchanged. 
A) double. 
B) quadruple. 
C) be reduced 50%. 
D) be reduced to 25% of its previous value. 
E) be unchanged.

Question 5

A woman drives toward the face of a cliff at 26.8 m/s.She sounds a burst on her 500-Hz car horn and then listens for the echo.Assuming 313 m/s to be the speed of sound,the woman hears an echo frequency of

Accepted Answer

A) about 595 Hz 
B) about 545 Hz 
C) exactly 500 Hz 
D) about 460 Hz 
E) exactly 1000 Hz 
A) about 595 Hz 
B) about 545 Hz 
C) exactly 500 Hz 
D) about 460 Hz 
E) exactly 1000 Hz

Question 6

Use the following scenario to answer the next question. A rope of length L and linear mass density F1F1F1S1 is tied to the ceiling on one end. The other end is tied to a spring with spring constant k,and the spring is then attached to the floor,extending it by A.
-The speed of a wave pulse at height h from the spring is

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 7

An observer is standing on the platform of a railway station.A train goes through the station without stopping.If the frequency of the train whistle decreases by a factor of 1.2 as it approaches and then passes him,calculate the speed of the train (assume the speed of sound in air = 343 m/s).

Accepted Answer

A) 112 km/hr 
B) 31.2 km/hr 
C) 56.0 km/hr 
D) 62.0 km/hr 
E) 122 km/hr 
A) 112 km/hr 
B) 31.2 km/hr 
C) 56.0 km/hr 
D) 62.0 km/hr 
E) 122 km/hr

Question 8

Waves on the surface of a liquid are observed to have a wavelength of 12.9 mm and a speed of 30.9 cm/s.The frequency of the wave motion is

Accepted Answer

A) 1.8 mHz 
B) 24 Hz 
C) 42 mHz 
D) 2.4 Hz 
E) 2.4 mHz 
A) 1.8 mHz 
B) 24 Hz 
C) 42 mHz 
D) 2.4 Hz 
E) 2.4 mHz

Question 9

A police car siren emits a sound at 600 Hz.If observer A moves toward the source at 50 km/hr,and the police car is traveling toward observer A at 100 km/hr (all speeds relative to the road),calculate the siren frequency heard by the observer A (assume the speed of sound in air = 343 m/s).

Accepted Answer

A) 626 Hz 
B) 600 Hz 
C) 679 Hz 
D) 577 Hz 
E) 970 Hz 
A) 626 Hz 
B) 600 Hz 
C) 679 Hz 
D) 577 Hz 
E) 970 Hz

Question 10

A wave given with amplitude A = 10 cm travels along a cord which has two sections,one with linear density 0.1 kg/m and the other with linear density 0.2 kg/m.The wave travels along the cord from the lighter density to the heavier.If the tension in the cord is 50 N,the amplitude of the reflected wave is

Accepted Answer

A) 0.65 cm 
B) 1.5 cm 
C) 5.9 cm 
D) 7.4 cm 
E) 8.3 cm 
A) 0.65 cm 
B) 1.5 cm 
C) 5.9 cm 
D) 7.4 cm 
E) 8.3 cm

Question 11

To double the rate at which energy is transmitted along a string,you could

Accepted Answer

A) double the angular frequency of the source. 
B) double the amplitude of the wave. 
C) double the tension in the string. 
D) quadruple the tension in the string. 
E) halve the linear density of the string. 
A) double the angular frequency of the source. 
B) double the amplitude of the wave. 
C) double the tension in the string. 
D) quadruple the tension in the string. 
E) halve the linear density of the string.

Question 12

A police car siren emits a sound at 600 Hz.If an observer moves toward the source at 50 km/hr,and the police car approaches the observer at 100 km/hr (all speeds relative to the road),calculate the siren frequency heard by the driver of the police car (assume the speed of sound in air = 343 m/s).

Accepted Answer

A) 626 Hz 
B) 600 Hz 
C) 679 Hz 
D) 577 Hz 
E) 970 Hz 
A) 626 Hz 
B) 600 Hz 
C) 679 Hz 
D) 577 Hz 
E) 970 Hz

Question 13

When the frequency of a source is doubled,the sound produced

Accepted Answer

A) travels at half its former speed. 
B) travels at twice its former speed. 
C) has half its former wavelength. 
D) has twice its former wavelength. 
E) is greatly improved in quality. 
A) travels at half its former speed. 
B) travels at twice its former speed. 
C) has half its former wavelength. 
D) has twice its former wavelength. 
E) is greatly improved in quality.

Question 14

A piano wire has a tension of 650 N and a mass per unit length of 0.060 g/cm.What is the speed of waves on this wire?

Accepted Answer

A) 1.0 $\times$ 102 m/s 
B) 3.3 $\times$ 102 m/s 
C) 1.0 $\times$ 103 m/s 
D) 33 m/s 
E) 52 m/s 
A) 1.0 $\times$ 102 m/s 
B) 3.3 $\times$ 102 m/s 
C) 1.0 $\times$ 103 m/s 
D) 33 m/s 
E) 52 m/s

Question 15

The equation of a traveling wave is   where the units are SI.The velocity of the wave is

Accepted Answer

A) 4.0 m/s 
B) 10 m/s 
C) 0.13 km/s 
D) 0.50 km/s 
E) 2.0 km/s 
A) 4.0 m/s 
B) 10 m/s 
C) 0.13 km/s 
D) 0.50 km/s 
E) 2.0 km/s

Question 16

In a sinusoidal traveling wave,the distance between two points that differ in phase by 2$\pi$ radians is the

Accepted Answer

A) frequency. 
B) period. 
C) amplitude. 
D) phase constant. 
E) wavelength. 
A) frequency. 
B) period. 
C) amplitude. 
D) phase constant. 
E) wavelength.

Question 17

During the passage of a longitudinal wave,a particle of the medium

Accepted Answer

A) remains in a fixed position. 
B) moves in a circle. 
C) moves at right angles to the direction of propagation. 
D) moves forward and backward along the line of propagation. 
E) moves forward with the velocity of the wave. 
A) remains in a fixed position. 
B) moves in a circle. 
C) moves at right angles to the direction of propagation. 
D) moves forward and backward along the line of propagation. 
E) moves forward with the velocity of the wave.

Question 18

An equation that gives the particle displacement for a medium in which there is a simple harmonic traveling wave is   where x and y are in centimeters and t is in seconds.At t = 2 s the speed of a particle at the location x = 4 cm is

Accepted Answer

A) 0 
B) 2 cm/s 
C) 4 cm/s 
D) 6 cm/s 
E) 8 cm/s 
A) 0 
B) 2 cm/s 
C) 4 cm/s 
D) 6 cm/s 
E) 8 cm/s

Question 19

A locomotive moving at a constant speed approaches and then passes a man standing at a crossing.The frequency of the locomotive's horn as the man hears it

Accepted Answer

A) gradually increases and then decreases. 
B) gradually decreases and then increases. 
C) abruptly changes as the locomotive passes. 
D) does not change at all. 
E) produces beats due to the Doppler effect. 
A) gradually increases and then decreases. 
B) gradually decreases and then increases. 
C) abruptly changes as the locomotive passes. 
D) does not change at all. 
E) produces beats due to the Doppler effect.

Question 20

We can hear sounds that are produced around a corner but cannot see light that is produced around a corner because

Accepted Answer

A) light travels only in straight lines whereas sound can travel in a curved path. 
B) sound has more energy than light. 
C) sound has shorter wavelengths than light. 
D) sound has longer wavelengths than light. 
E) None of these is correct. 
A) light travels only in straight lines whereas sound can travel in a curved path. 
B) sound has more energy than light. 
C) sound has shorter wavelengths than light. 
D) sound has longer wavelengths than light. 
E) None of these is correct.

Exam 15: Wave Motion

A string under tension carries transverse waves traveling at speed v.If the same string is under four times the tension,what is the wave speed?

A general rule for estimating the distance in kilometers between you and a lightning bolt is to count the number of seconds between the time you see the flash and the time you hear the thunder and then divide by

Which curve best represents the variation of wave velocity with linear density in a vibrating string?

If you were to double the speed of a wave on a string while keeping the frequency and amplitude of the wave constant,the rate at which energy is delivered by the wave would

A woman drives toward the face of a cliff at 26.8 m/s.She sounds a burst on her 500-Hz car horn and then listens for the echo.Assuming 313 m/s to be the speed of sound,the woman hears an echo frequency of

An observer is standing on the platform of a railway station.A train goes through the station without stopping.If the frequency of the train whistle decreases by a factor of 1.2 as it approaches and then passes him,calculate the speed of the train (assume the speed of sound in air = 343 m/s).

Waves on the surface of a liquid are observed to have a wavelength of 12.9 mm and a speed of 30.9 cm/s.The frequency of the wave motion is

A police car siren emits a sound at 600 Hz.If observer A moves toward the source at 50 km/hr,and the police car is traveling toward observer A at 100 km/hr (all speeds relative to the road),calculate the siren frequency heard by the observer A (assume the speed of sound in air = 343 m/s).

To double the rate at which energy is transmitted along a string,you could

A police car siren emits a sound at 600 Hz.If an observer moves toward the source at 50 km/hr,and the police car approaches the observer at 100 km/hr (all speeds relative to the road),calculate the siren frequency heard by the driver of the police car (assume the speed of sound in air = 343 m/s).

When the frequency of a source is doubled,the sound produced

A piano wire has a tension of 650 N and a mass per unit length of 0.060 g/cm.What is the speed of waves on this wire?

The equation of a traveling wave is where the units are SI.The velocity of the wave is

In a sinusoidal traveling wave,the distance between two points that differ in phase by 2 π\piπ radians is the

During the passage of a longitudinal wave,a particle of the medium

An equation that gives the particle displacement for a medium in which there is a simple harmonic traveling wave is where x and y are in centimeters and t is in seconds.At t = 2 s the speed of a particle at the location x = 4 cm is

A locomotive moving at a constant speed approaches and then passes a man standing at a crossing.The frequency of the locomotive's horn as the man hears it

We can hear sounds that are produced around a corner but cannot see light that is produced around a corner because

Systems of Measurement

Motion in One Dimension

Motion in Two and Three Dimensions

Newtons Laws

Applications of Newtons Laws

Work and Energy

Conservation of Energy

Systems of Particles and Conservation of Linear Momentum

Rotation

Conservation of Angular Momentum

Gravity

Static Equilibrium and Elasticity

Fluids

Oscillations

Superposition and Standing Waves

Temperature and the Kinetic Theory of Gases

Heat and the First Law of Thermodynamics

The Second Law of Thermodynamics

Thermal Properties and Processes

The Electric Field I: Discrete Charge Distributions

The Electric Field Ii: Continuous Charge Distributions

Electric Potential

Capacitance

Electric Current and Direct-Current Circuits

The Magnetic Field

Sources of the Magnetic Field

Magnetic Induction

Alternating-Current Circuits

Maxwells Equations and Electromagnetic Waves

Properties of Light

Optical Images

Interference and Diffraction

Wave Particle Duality and Quantum Physics

Applications of the Schrodinger Equation

Atoms

Molecules

Solids and the Theory of Conduction

Relativity

Nuclear Physics

Elementary Particles and the Beginning of the Universe

Filters

In a sinusoidal traveling wave,the distance between two points that differ in phase by 2 $\pi$ radians is the