Question 1

From the figure above, you can conclude that

Accepted Answer

A)  the medium to the left of the boundary is denser than the medium to the right. 
B)  the medium to the right of the boundary is denser than the medium to the left. 
C)  the pulse is initially traveling from right to left. 
D)  the wave has lost energy as a result. 
E)  None of these is correct. 
A)  the medium to the left of the boundary is denser than the medium to the right. 
B)  the medium to the right of the boundary is denser than the medium to the left. 
C)  the pulse is initially traveling from right to left. 
D)  the wave has lost energy as a result. 
E)  None of these is correct.

Question 2

The equation that gives the particle displacement of a medium in which there is a simple harmonic progressive wave is
Y(x, t) = (2/$\pi$) sin $\pi$(x - 4t),
Where the units are SI. At t = 2 s, the velocity of a particle at x = 10 m is

Accepted Answer

A)  0 
B)  2 m/s 
C)  4/$\pi$ m/s 
D)  4 m/s 
E)  8 m/s 
A)  0 
B)  2 m/s 
C)  4/$\pi$ m/s 
D)  4 m/s 
E)  8 m/s

Question 3

A wave of frequency f is transmitted on a string with tension T. If the tension is increased by a factor of 4 and the frequency and amplitude are unchanged, the power transmitted changed by

Accepted Answer

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

Question 4

A string is stretched by a force of 4.0 N. The mass per unit length of the string is 4.0 $\times$ 10-4 kg/m. A transverse wave would travel along this string with a velocity of approximately

Accepted Answer

A)  0.80 cm/s 
B)  2.0 cm/s 
C)  8.0 cm/s 
D)  50 m/s 
E)  1.0 $\times$ 102 m/s 
A)  0.80 cm/s 
B)  2.0 cm/s 
C)  8.0 cm/s 
D)  50 m/s 
E)  1.0 $\times$ 102 m/s

Question 5

Geologists use explosives to map the subterranean. The times for the reflected waves to arrive at a monitoring station can tell a great deal about the composition of the rock structures. Suppose the time it takes for a wave that is reflected from the interface of (1) and (2) is 2 s, and the time for another wave that is reflected between (2) and (3) is 2.5 s and the speed of the wave in layer (1) is 6 km/s and in layer (2) is 4 km/s, how thick is layer (2)?

Accepted Answer

A)  2 km 
B)  1 km 
C)  3 km 
D)  6 km 
E)  8 km 
A)  2 km 
B)  1 km 
C)  3 km 
D)  6 km 
E)  8 km

Question 6

Which of the following wavefronts results from a supersonic flight?

Accepted Answer

A)  (1) 
B)  (2) 
C)  (3) 
D)  (1) and (3) 
E)  they are all supersonic 
A)  (1) 
B)  (2) 
C)  (3) 
D)  (1) and (3) 
E)  they are all supersonic

Question 7

The frequency of a car horn is f. What frequency is observed if both the car and the observer are at rest, but a wind is blowing toward the observer?

Accepted Answer

A)  f 
B)  greater than f 
C)  less than f 
D)  either greater or less than f 
E)  far greater than f, depending on how wind speed compares with the speed of sound 
A)  f 
B)  greater than f 
C)  less than f 
D)  either greater or less than f 
E)  far greater than f, depending on how wind speed compares with the speed of sound

Question 8

A sinusoidal wave train is moving along a string. The equation giving the displacement as a function of position and time is
Y(x, t) = 0.12 sin 8$\pi$(t - x/50),
Where the units are SI. For a particle at x = 5 m when t = 2.4 s, the velocity of the particle is

Accepted Answer

A)  3.7 cm/s 
B)  27 cm/s 
C)  93 cm/s 
D)  1.6 m/s 
E)  3.0 m/s 
A)  3.7 cm/s 
B)  27 cm/s 
C)  93 cm/s 
D)  1.6 m/s 
E)  3.0 m/s

Question 9

The angle of the shock wave produced by a jet traveling at Mach 3 at an altitude of 4000 m (assume the speed of sound to be 340 m/s at this altitude) is approximately

Accepted Answer

A)  10º 
B)  13º 
C)  19º 
D)  20º 
E)  38º 
A)  10º 
B)  13º 
C)  19º 
D)  20º 
E)  38º

Question 10

Two waveforms of the same frequency are moving to the right. The power PA transmitted by wave A is equal to

Accepted Answer

A)  2PB/3 
B)  9PB/4 
C)    PB        
D)  4PB/9 
E)  PB  
A)  2PB/3 
B)  9PB/4 
C)    PB        
D)  4PB/9 
E)  PB

Question 11

If you were to double the amplitude of a wave on a string while keeping the speed and frequency of the wave constant, the energy 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 12

While you are standing on a corner, a police car with a 1-kHz siren drives past you at
30 m/s with its siren on. The speed of sound is 340 m/s. After the car has passed, the frequency you hear is about

Accepted Answer

A)  1.10 kHz 
B)  1.09 kHz 
C)  1.00 kHz 
D)  919 Hz 
E)  912 Hz 
A)  1.10 kHz 
B)  1.09 kHz 
C)  1.00 kHz 
D)  919 Hz 
E)  912 Hz

Question 13

The picture on the right represents the wavefronts of a supersonic flight. The angle $\theta$ = 40S1U1P1$\circ$S1S1P0. If the speed of sound is 300 m/s, what is the speed of the plane?

Accepted Answer

A)  360 m/s 
B)  330 m/s 
C)  300 m/s 
D)  390 m/s 
E)  470 m/s 
A)  360 m/s 
B)  330 m/s 
C)  300 m/s 
D)  390 m/s 
E)  470 m/s

Question 14

The average rate at which energy is transmitted along a string depends on

Accepted Answer

A)  the linear density of the string. 
B)  the square of the angular frequency of the source. 
C)  the square of the amplitude of the wave. 
D)  the speed of the wave. 
E)  all of these factors 
A)  the linear density of the string. 
B)  the square of the angular frequency of the source. 
C)  the square of the amplitude of the wave. 
D)  the speed of the wave. 
E)  all of these factors

Question 15

The intensity of a wave at a certain point is I. A second wave has twice the energy density and three times the speed of the first. What is the intensity of the second wave?

Accepted Answer

A)  I 
B)  2I 
C)  3I 
D)  6I 
E)  2I/3 
A)  I 
B)  2I 
C)  3I 
D)  6I 
E)  2I/3

Question 16

A set of waves has a speed of 4.2 m/s and a frequency of 2.0 Hz. The wavelength is

Accepted Answer

A)  8.4 m 
B)  2.1 m 
C)  0.48 m 
D)  0.84 m 
E)  3.2 m 
A)  8.4 m 
B)  2.1 m 
C)  0.48 m 
D)  0.84 m 
E)  3.2 m

Question 17

The graph shows a wave moving from left to right. If the period of this wave motion is 50 ms, the wave is moving with a velocity of

Accepted Answer

A)  40$\pi$ cm/s 
B)  1.6$\pi$ m/s 
C)  1.6 m/s 
D)  80 cm/s 
E)  0.40 cm/s 
A)  40$\pi$ cm/s 
B)  1.6$\pi$ m/s 
C)  1.6 m/s 
D)  80 cm/s 
E)  0.40 cm/s

Question 18

A sinusoidal wave train is moving along a string. The equation giving the displacement y of a point at coordinate x has the form
Y(x, t) = 0.15 sin[10$\pi$(t - x/60)]
Where the units are SI. The wavelength is

Accepted Answer

A)  8.0 cm 
B)  15 cm 
C)  6.0 m 
D)  12 m 
E)  60 m 
A)  8.0 cm 
B)  15 cm 
C)  6.0 m 
D)  12 m 
E)  60 m

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

A longitudinal wave is distinguished from a transverse wave by the fact that in longitudinal waves

Accepted Answer

A)  the particle vibration is parallel to the direction of propagation. 
B)  the particle vibration is perpendicular to the direction of propagation. 
C)  energy is transported from one point in space to another point. 
D)  vibrations occur only in air or water. 
E)  energy is not transported from one point in space to another point. 
A)  the particle vibration is parallel to the direction of propagation. 
B)  the particle vibration is perpendicular to the direction of propagation. 
C)  energy is transported from one point in space to another point. 
D)  vibrations occur only in air or water. 
E)  energy is not transported from one point in space to another point.

From the figure above, you can conclude that

The equation that gives the particle displacement of a medium in which there is a simple harmonic progressive wave is Y(x, t) = (2/ $\pi$ ) sin $\pi$ (x - 4t), Where the units are SI. At t = 2 s, the velocity of a particle at x = 10 m is

A wave of frequency f is transmitted on a string with tension T. If the tension is increased by a factor of 4 and the frequency and amplitude are unchanged, the power transmitted changed by

A string is stretched by a force of 4.0 N. The mass per unit length of the string is 4.0 $\times$ 10^-4 kg/m. A transverse wave would travel along this string with a velocity of approximately

Which of the following wavefronts results from a supersonic flight?

The frequency of a car horn is f. What frequency is observed if both the car and the observer are at rest, but a wind is blowing toward the observer?

A sinusoidal wave train is moving along a string. The equation giving the displacement as a function of position and time is Y(x, t) = 0.12 sin 8 $\pi$ (t - x/50), Where the units are SI. For a particle at x = 5 m when t = 2.4 s, the velocity of the particle is

The angle of the shock wave produced by a jet traveling at Mach 3 at an altitude of 4000 m (assume the speed of sound to be 340 m/s at this altitude) is approximately

Two waveforms of the same frequency are moving to the right. The power P_A transmitted by wave A is equal to

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

While you are standing on a corner, a police car with a 1-kHz siren drives past you at 30 m/s with its siren on. The speed of sound is 340 m/s. After the car has passed, the frequency you hear is about

The average rate at which energy is transmitted along a string depends on

The intensity of a wave at a certain point is I. A second wave has twice the energy density and three times the speed of the first. What is the intensity of the second wave?

A set of waves has a speed of 4.2 m/s and a frequency of 2.0 Hz. The wavelength is

The graph shows a wave moving from left to right. If the period of this wave motion is 50 ms, the wave is moving with a velocity of

A sinusoidal wave train is moving along a string. The equation giving the displacement y of a point at coordinate x has the form Y(x, t) = 0.15 sin[10 $\pi$ (t - x/60)] Where the units are SI. The wavelength 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

A longitudinal wave is distinguished from a transverse wave by the fact that in longitudinal waves

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

Filters

Exam 15: Wave Motion

From the figure above, you can conclude that

The equation that gives the particle displacement of a medium in which there is a simple harmonic progressive wave is Y(x, t) = (2/ π\piπ ) sin π\piπ (x - 4t), Where the units are SI. At t = 2 s, the velocity of a particle at x = 10 m is

A wave of frequency f is transmitted on a string with tension T. If the tension is increased by a factor of 4 and the frequency and amplitude are unchanged, the power transmitted changed by

A string is stretched by a force of 4.0 N. The mass per unit length of the string is 4.0 ×\times× 10-4 kg/m. A transverse wave would travel along this string with a velocity of approximately

Which of the following wavefronts results from a supersonic flight?

The frequency of a car horn is f. What frequency is observed if both the car and the observer are at rest, but a wind is blowing toward the observer?

A sinusoidal wave train is moving along a string. The equation giving the displacement as a function of position and time is Y(x, t) = 0.12 sin 8 π\piπ (t - x/50), Where the units are SI. For a particle at x = 5 m when t = 2.4 s, the velocity of the particle is

The angle of the shock wave produced by a jet traveling at Mach 3 at an altitude of 4000 m (assume the speed of sound to be 340 m/s at this altitude) is approximately

Two waveforms of the same frequency are moving to the right. The power PA transmitted by wave A is equal to

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

While you are standing on a corner, a police car with a 1-kHz siren drives past you at 30 m/s with its siren on. The speed of sound is 340 m/s. After the car has passed, the frequency you hear is about

The picture on the right represents the wavefronts of a supersonic flight. The angle θ\thetaθ = 40 ∘\circ∘ . If the speed of sound is 300 m/s, what is the speed of the plane?

The average rate at which energy is transmitted along a string depends on

The intensity of a wave at a certain point is I. A second wave has twice the energy density and three times the speed of the first. What is the intensity of the second wave?

A set of waves has a speed of 4.2 m/s and a frequency of 2.0 Hz. The wavelength is

The graph shows a wave moving from left to right. If the period of this wave motion is 50 ms, the wave is moving with a velocity of

A sinusoidal wave train is moving along a string. The equation giving the displacement y of a point at coordinate x has the form Y(x, t) = 0.15 sin[10 π\piπ (t - x/60)] Where the units are SI. The wavelength 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

A longitudinal wave is distinguished from a transverse wave by the fact that in longitudinal waves

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

Filters

The equation that gives the particle displacement of a medium in which there is a simple harmonic progressive wave is Y(x, t) = (2/ $\pi$ ) sin $\pi$ (x - 4t), Where the units are SI. At t = 2 s, the velocity of a particle at x = 10 m is

A string is stretched by a force of 4.0 N. The mass per unit length of the string is 4.0 $\times$ 10^-4 kg/m. A transverse wave would travel along this string with a velocity of approximately

A sinusoidal wave train is moving along a string. The equation giving the displacement as a function of position and time is Y(x, t) = 0.12 sin 8 $\pi$ (t - x/50), Where the units are SI. For a particle at x = 5 m when t = 2.4 s, the velocity of the particle is

Two waveforms of the same frequency are moving to the right. The power P_A transmitted by wave A is equal to

A sinusoidal wave train is moving along a string. The equation giving the displacement y of a point at coordinate x has the form Y(x, t) = 0.15 sin[10 $\pi$ (t - x/60)] Where the units are SI. The wavelength is