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# Halliday/Resnick/Walker Fundamentals of Physics 8 th edition - PowerPoint PPT Presentation

Halliday/Resnick/Walker Fundamentals of Physics 8 th edition. Classroom Response System Questions. Chapter 17 Waves II. Reading Quiz Questions. 17.2.1. What is the term used to describe the surfaces over which the oscillations due to a sound wave have the same value? a) rays

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Halliday/Resnick/WalkerFundamentals of Physics 8th edition

• Classroom Response System Questions

Chapter 17 Waves II

17.2.1. What is the term used to describe the surfaces over which the oscillations due to a sound wave have the same value?

a) rays

b) wave packets

c) beats

d) phasors

e) wave fronts

17.2.1. What is the term used to describe the surfaces over which the oscillations due to a sound wave have the same value?

a) rays

b) wave packets

c) beats

d) phasors

e) wave fronts

17.2.2. What is the term used to describe the directed lines that are perpendicular to wavefronts and indicate their direction of travel?

a) rays

b) wave packets

c) beats

d) phasors

e) phonons

17.2.2. What is the term used to describe the directed lines that are perpendicular to wavefronts and indicate their direction of travel?

a) rays

b) wave packets

c) beats

d) phasors

e) phonons

17.3.1. Which one of the following expressions correctly gives the relationship between the speed of sound v in a medium and the properties of that medium?

a)

b)

c)

d) The speed is only proportional to the inertial property.

e) The speed is only proportional to the elastic property.

17.3.1. Which one of the following expressions correctly gives the relationship between the speed of sound v in a medium and the properties of that medium?

a)

b)

c)

d) The speed is only proportional to the inertial property.

e) The speed is only proportional to the elastic property.

17.3.2. Which one of the following statements concerning the speed of sound in a medium is true?

a) The speed of sound is greater for materials that have larger densities than it is for materials that have smaller densities and all other properties equal.

b) The speed of sound is greater for materials that have smaller densities than it is for materials that have larger densities and all other properties equal.

c) The speed of sound is greater for materials that have larger mass than it is for materials that have smaller mass and all other properties equal.

d) The speed of sound is greater for materials that have smaller bulk modulus than it is for materials that have s larger bulk modulus and all other properties equal.

17.3.2. Which one of the following statements concerning the speed of sound in a medium is true?

a) The speed of sound is greater for materials that have larger densities than it is for materials that have smaller densities and all other properties equal.

b) The speed of sound is greater for materials that have smaller densities than it is for materials that have larger densities and all other properties equal.

c) The speed of sound is greater for materials that have larger mass than it is for materials that have smaller mass and all other properties equal.

d) The speed of sound is greater for materials that have smaller bulk modulus than it is for materials that have s larger bulk modulus and all other properties equal.

17.3.3. A girl is playing a trumpet. The sound waves produced are traveling through air to your ear. Which one of the following statements is false concerning this situation?

a) A high-frequency sound that the trumpet produces is interpreted as a high-pitched sound.

b) Air molecules between the trumpet and your ear vibrate back and forth parallel to the direction the waves are traveling.

c) The loudness of the sound wave involves the size of the oscillations in air pressure.

d) The sounds from the trumpet are longitudinal waves.

e) The sound travels at the speed of light to your ear.

17.3.3. A girl is playing a trumpet. The sound waves produced are traveling through air to your ear. Which one of the following statements is false concerning this situation?

a) A high-frequency sound that the trumpet produces is interpreted as a high-pitched sound.

b) Air molecules between the trumpet and your ear vibrate back and forth parallel to the direction the waves are traveling.

c) The loudness of the sound wave involves the size of the oscillations in air pressure.

d) The sounds from the trumpet are longitudinal waves.

e) The sound travels at the speed of light to your ear.

17.3.4. For which one of the following choices does the speed of sound have the largest value?

a) vacuum

b) air

c) copper

d) alcohol

e) helium

17.3.4. For which one of the following choices does the speed of sound have the largest value?

a) vacuum

b) air

c) copper

d) alcohol

e) helium

17.3.5. In determining the speed of sound in a solid bar, such as one made of steel, which of the following choices is not needed?

a) density of the bar

b) bulk modulus

c) Boltzmann’s constant

17.3.5. In determining the speed of sound in a solid bar, such as one made of steel, which of the following choices is not needed?

a) density of the bar

b) bulk modulus

c) Boltzmann’s constant

17.3.6. A guitar string is plucked and set into vibration. The vibrating string disturbs the surrounding air, resulting in a sound wave. Which entry in the table below is correct?

17.3.6. A guitar string is plucked and set into vibration. The vibrating string disturbs the surrounding air, resulting in a sound wave. Which entry in the table below is correct?

17.4.1. Which one of the following statements concerning traveling sound waves in air is false?

a) Traveling sound waves are longitudinal waves.

b) Traveling sound waves consist of alternating regions of compressed and expanded air.

c) A typical speed of sound in air is 680 m/s.

d) The displacement amplitude of a traveling sound wave may be described by a sinusoidal function.

e) The pressure amplitude is 90 out of phase relative to the displacement amplitude of a traveling sound wave.

17.4.1. Which one of the following statements concerning traveling sound waves in air is false?

a) Traveling sound waves are longitudinal waves.

b) Traveling sound waves consist of alternating regions of compressed and expanded air.

c) A typical speed of sound in air is 680 m/s.

d) The displacement amplitude of a traveling sound wave may be described by a sinusoidal function.

e) The pressure amplitude is 90 out of phase relative to the displacement amplitude of a traveling sound wave.

17.4.2. Which one of the following statements concerning the pressure amplitude of a traveling sound wave in air is false?

a) The pressure amplitude is inversely proportional to the

displacement amplitude.

b) The pressure amplitude is 90 out of phase relative to the displacement amplitude.

c) A negative value of the pressure amplitude corresponds to an expansion of the air.

d) The pressure amplitude depends on the air density.

e) When the displacement amplitude is at its maximum value, the pressure amplitude is zero Pa.

17.4.2. Which one of the following statements concerning the pressure amplitude of a traveling sound wave in air is false?

a) The pressure amplitude is inversely proportional to the

displacement amplitude.

b) The pressure amplitude is 90 out of phase relative to the displacement amplitude.

c) A negative value of the pressure amplitude corresponds to an expansion of the air.

d) The pressure amplitude depends on the air density.

e) When the displacement amplitude is at its maximum value, the pressure amplitude is zero Pa.

17.5.1. The drawing shows two sets of sound waves, created by two sources labeled "A" and "B." The black half-circles represent wave crests from A, and the grey half-circles represent wave crests from B. Suppose that individual wave crests from either source A or source B alone are at +5 µm relative to the undisturbed air molecule positions. What is the displacement of the air molecules at the point marked "x" that is at the mid-point between to crests on each wave?

a) +10 µm

b) +5 µm

c) 0

d) 5 µm

e) 10 µm

17.5.1. The drawing shows two sets of sound waves, created by two sources labeled "A" and "B." The black half-circles represent wave crests from A, and the grey half-circles represent wave crests from B. Suppose that individual wave crests from either source A or source B alone are at +5 µm relative to the undisturbed air molecule positions. What is the displacement of the air molecules at the point marked "x" that is at the mid-point between to crests on each wave?

a) +10 µm

b) +5 µm

c) 0

d) 5 µm

e) 10 µm

17.5.2. Two pulses of identical shape travel toward each other in opposite directions on a string, as shown in the figure. Which one of the following statements concerning this situation is true?

a) The pulses will pass through each other and produce beats.

b) As the pulses pass through each other, they will interfere destructively.

c) The pulses will interfere to produce a standing wave.

d) The pulses will reflect from each other.

e) The pulses will diffract from each other.

17.5.2. Two pulses of identical shape travel toward each other in opposite directions on a string, as shown in the figure. Which one of the following statements concerning this situation is true?

a) The pulses will pass through each other and produce beats.

b) As the pulses pass through each other, they will interfere destructively.

c) The pulses will interfere to produce a standing wave.

d) The pulses will reflect from each other.

e) The pulses will diffract from each other.

17.5.3. Sound waves are emitted from two speakers. Which one of the following statements about sound wave interference is false?

a) In a region where both destructive and constructive interference occur, energy is not conserved.

b) Destructive interference occurs when two waves are exactly out of phase when they meet.

c) Interference redistributes the energy carried by the individual waves.

d) Constructive interference occurs when two waves are exactly in phase when they meet.

e) Sound waves undergo diffraction as they exit each speaker.

17.5.3. Sound waves are emitted from two speakers. Which one of the following statements about sound wave interference is false?

a) In a region where both destructive and constructive interference occur, energy is not conserved.

b) Destructive interference occurs when two waves are exactly out of phase when they meet.

c) Interference redistributes the energy carried by the individual waves.

d) Constructive interference occurs when two waves are exactly in phase when they meet.

e) Sound waves undergo diffraction as they exit each speaker.

17.6.1. Which of the following expressions correctly relates the amplitude sm of a sound wave to its intensity?

a)

b)

c)

d)

e)

17.6.1. Which of the following expressions correctly relates the amplitude sm of a sound wave to its intensity?

a)

b)

c)

d)

e)

17.6.2. Complete the following statement: The intensity of sound that is emitted isotropically

a) is inversely proportional to the square of the distance from the source.

b) is proportional to the square of the distance from the source.

c) is inversely proportional to the square of the amplitude of the wave.

d) is proportional to the distance from the source.

e) is inversely proportional to the distance from the source.

17.6.2. Complete the following statement: The intensity of sound that is emitted isotropically

a) is inversely proportional to the square of the distance from the source.

b) is proportional to the square of the distance from the source.

c) is inversely proportional to the square of the amplitude of the wave.

d) is proportional to the distance from the source.

e) is inversely proportional to the distance from the source.

17.6.3. Complete the following statement: The power of a sound wave that is emitted isotropically

a) is inversely proportional to the square of the distance from the source.

b) is proportional to the square of the distance from the source.

c) is inversely proportional to the square of the amplitude of the wave.

d) is inversely proportional to the distance from the source.

e) None of the above statements are true.

17.6.3. Complete the following statement: The power of a sound wave that is emitted isotropically

a) is inversely proportional to the square of the distance from the source.

b) is proportional to the square of the distance from the source.

c) is inversely proportional to the square of the amplitude of the wave.

d) is inversely proportional to the distance from the source.

e) None of the above statements are true.

17.6.4. Which one of the following statements best describes the concept of sound intensity?

a) Sound intensity is the amount of energy the sound waves carries at a particular location.

b) Sound intensity is the sound power that passes perpendicularly through a surface divided by the amplitude of the wave.

c) Sound intensity is the amplitude of the wave.

d) Sound intensity is the constant power per unit area of a sound wave as it travels from one location to another.

e) Sound intensity is the sound power that passes perpendicularly through a surface divided by the area of that surface.

17.6.4. Which one of the following statements best describes the concept of sound intensity?

a) Sound intensity is the amount of energy the sound waves carries at a particular location.

b) Sound intensity is the sound power that passes perpendicularly through a surface divided by the amplitude of the wave.

c) Sound intensity is the amplitude of the wave.

d) Sound intensity is the constant power per unit area of a sound wave as it travels from one location to another.

e) Sound intensity is the sound power that passes perpendicularly through a surface divided by the area of that surface.

17.6.5. The threshold of hearing is the smallest sound intensity that a human ear can hear. What intensity corresponds to the threshold of hearing?

a) 1012 W/m2

b) 1010 W/m2

c) 108 W/m2

d) 106 W/m2

e) 104 W/m2

17.6.5. The threshold of hearing is the smallest sound intensity that a human ear can hear. What intensity corresponds to the threshold of hearing?

a) 1012 W/m2

b) 1010 W/m2

c) 108 W/m2

d) 106 W/m2

e) 104 W/m2

17.6.6. The sound intensity level is reported in decibels. If one doubles the intensity of sound, by what factor does the perceived loudness, in decibels, change?

a) 10 dB

b) 20 dB

c) 3 dB

d) 2 dB

e) 5 dB

17.6.6. The sound intensity level is reported in decibels. If one doubles the intensity of sound, by what factor does the perceived loudness, in decibels, change?

a) 10 dB

b) 20 dB

c) 3 dB

d) 2 dB

e) 5 dB

17.6.7. The sound intensity level is reported in decibels. If the sound intensity is at the threshold for hearing, what is the sound intensity level in decibels?

a) zero dB

b) 1 dB

c) 12 dB

d) 10 dB

e) 3 dB

17.6.7. The sound intensity level is reported in decibels. If the sound intensity is at the threshold for hearing, what is the sound intensity level in decibels?

a) zero dB

b) 1 dB

c) 12 dB

d) 10 dB

e) 3 dB

17.7.1. A wire of mass If the sound intensity is at the threshold for hearing, what is the sound intensity level in decibels?m and length L carries a transverse wave. If the tension applied to the wire is T, which one of the following statements concerning the wave is true?

a) The wavelength of the wave depends only on L.

b) The wavelength of the wave depends on L, m, and T.

c) The speed of the wave depends on L, m, and T.

d) The speed of the wave depends only on m and L.

e) Statements (a) and (d) are both true.

17.7.1. A wire of mass If the sound intensity is at the threshold for hearing, what is the sound intensity level in decibels?m and length L carries a transverse wave. If the tension applied to the wire is T, which one of the following statements concerning the wave is true?

a) The wavelength of the wave depends only on L.

b) The wavelength of the wave depends on L, m, and T.

c) The speed of the wave depends on L, m, and T.

d) The speed of the wave depends only on m and L.

e) Statements (a) and (d) are both true.

17.7.2. The drawings show standing waves of sound in six organ pipes of the same length. Each pipe has one end open and the other end closed. Some of the drawings show situations that are not possible. Which one(s) is(are) not possible?

a) 4 only

b) 1 and 4

c) 5 and 6

d) 2 and 3

e) 4 and 5

17.7.2. The drawings show standing waves of sound in six organ pipes of the same length. Each pipe has one end open and the other end closed. Some of the drawings show situations that are not possible. Which one(s) is(are) not possible?

a) 4 only

b) 1 and 4

c) 5 and 6

d) 2 and 3

e) 4 and 5

17.7.3. The drawings show standing waves of sound in six organ pipes of the same length. Each pipe has one end open and the other end closed. Some of the drawings show situations that are not possible. Which one of these tubes emits a sound with the lowest frequency?

a) 1

b) 2

c) 3

d) 4

e) 6

17.7.3. The drawings show standing waves of sound in six organ pipes of the same length. Each pipe has one end open and the other end closed. Some of the drawings show situations that are not possible. Which one of these tubes emits a sound with the lowest frequency?

a) 1

b) 2

c) 3

d) 4

e) 6

a) when the wave is a standing wave

b) when the wave is refracted

c) when the wave is diffracted

d) when two waves of slightly different frequency combine

e) when two waves of slightly different amplitude combine

a) when the wave is a standing wave

b) when the wave is refracted

c) when the wave is diffracted

d) when two waves of slightly different frequency combine

e) when two waves of slightly different amplitude combine

17.8.2. Which one of the following superpositions will result in beats?

a) the superposition of waves that are identical except for slightly different amplitudes

b) the superposition of waves that are identical except for slightly different frequencies

c) the superposition of identical waves that travel in the same direction

d) the superposition of identical waves that travel in opposite directions

e) the superposition of waves that travel with different speeds

17.8.2. Which one of the following superpositions will result in beats?

a) the superposition of waves that are identical except for slightly different amplitudes

b) the superposition of waves that are identical except for slightly different frequencies

c) the superposition of identical waves that travel in the same direction

d) the superposition of identical waves that travel in opposite directions

e) the superposition of waves that travel with different speeds

17.8.3. A guitar string produces 4 beats/s when sounded with a 250 Hz tuning fork and 9 beats per second when sounded with a 255 Hz tuning fork. What is the vibrational frequency of the string?

a) 246 Hz

b) 240 Hz

c) 259 Hz

d) 254 Hz

e) 263 Hz

17.8.3. A guitar string produces 4 beats/s when sounded with a 250 Hz tuning fork and 9 beats per second when sounded with a 255 Hz tuning fork. What is the vibrational frequency of the string?

a) 246 Hz

b) 240 Hz

c) 259 Hz

d) 254 Hz

e) 263 Hz

17.9.1. On a warm spring day, you are waiting at a red traffic light listening to your favorite radio station with the windows down. The driver in a car passing you in the left turn lane at a constant speed happens to be listening to the same radio station. What do you notice as the car approaches and passes you?

a) The sound from the passing car seems to be at a lower frequency when approaching and at a higher frequency when moving away compared to the sound from your radio.

b) The sound from the passing car seems to be at a higher frequency when approaching and at a lower frequency when moving away compared to the sound from your radio.

c) As the car approaches, the shift to higher frequencies increases as the distance decreases between the two cars.

d) As the car approaches, the shift to lower frequencies increases as the distance decreases between the two cars.

e) As the car approaches, the shift to lower frequencies decreases as the distance decreases between the two cars.

17.9.1. On a warm spring day, you are waiting at a red traffic light listening to your favorite radio station with the windows down. The driver in a car passing you in the left turn lane at a constant speed happens to be listening to the same radio station. What do you notice as the car approaches and passes you?

a) The sound from the passing car seems to be at a lower frequency when approaching and at a higher frequency when moving away compared to the sound from your radio.

b) The sound from the passing car seems to be at a higher frequency when approaching and at a lower frequency when moving away compared to the sound from your radio.

c) As the car approaches, the shift to higher frequencies increases as the distance decreases between the two cars.

d) As the car approaches, the shift to lower frequencies increases as the distance decreases between the two cars.

e) As the car approaches, the shift to lower frequencies decreases as the distance decreases between the two cars.

17.9.2. Which of the following occurs when the Doppler effect is produced by a moving source of sound?

a) interference

b) superposition

c) sound intensity changes

d) frequency changes

e) beats

17.9.2. Which of the following occurs when the Doppler effect is produced by a moving source of sound?

a) interference

b) superposition

c) sound intensity changes

d) frequency changes

e) beats

17.9.3. Astronomers can determine the velocity of a galaxy relative to the Earth by observing the light waves emitted by certain elements. If the light frequency from hydrogen atoms is shifted toward a lower frequency as compared to the light emitted from hydrogen atoms on Earth, which one of the following statements correctly describes the velocity of the galaxy?

a) The galaxy is moving away from the Earth.

b) The galaxy is moving toward the Earth.

c) The galaxy is moving along a direction that is perpendicular to the line connecting the Earth and the galaxy.

d) The galaxy is not moving relative to the Earth.

e) There is too little information given to determine the direction of the velocity of the galaxy.

17.9.3. Astronomers can determine the velocity of a galaxy relative to the Earth by observing the light waves emitted by certain elements. If the light frequency from hydrogen atoms is shifted toward a lower frequency as compared to the light emitted from hydrogen atoms on Earth, which one of the following statements correctly describes the velocity of the galaxy?

a) The galaxy is moving away from the Earth.

b) The galaxy is moving toward the Earth.

c) The galaxy is moving along a direction that is perpendicular to the line connecting the Earth and the galaxy.

d) The galaxy is not moving relative to the Earth.

e) There is too little information given to determine the direction of the velocity of the galaxy.

17.9.4. You are riding a bicycle along the side of a road when an ambulance comes up behind you with its siren on. As the ambulance passes, you notice that the sound of the siren changes. How does it change as it passes?

a) The frequency decreases and then increases.

b) The frequency increases and then decreases.

c) The frequency continually increases.

d) The frequency continually decreases.

e) The frequency decreases to a lower frequency.

17.9.4. You are riding a bicycle along the side of a road when an ambulance comes up behind you with its siren on. As the ambulance passes, you notice that the sound of the siren changes. How does it change as it passes?

a) The frequency decreases and then increases.

b) The frequency increases and then decreases.

c) The frequency continually increases.

d) The frequency continually decreases.

e) The frequency decreases to a lower frequency.

17.9.5. In the formulas for calculating the frequency an observer hears during the Doppler effect, what is the term vS?

a) speed of the observer

b) speed of sound

c) speed of the source

d) speed of light

e) wind speed

17.9.5. In the formulas for calculating the frequency an observer hears during the Doppler effect, what is the term vS?

a) speed of the observer

b) speed of sound

c) speed of the source

d) speed of light

e) wind speed

17.10.1. Under which of the following conditions does a shock wave occur?

a) when two waves of differing frequencies superpose

b) when the temperature of air is greater than the temperature of the source of the sound

c) when the pressure amplitude exceeds the maximum pressure amplitude that the human ear can tolerate

d) when the source of a sound wave exceeds the speed of sound

e) when the sound intensity level exceeds 130 dB

17.10.1. Under which of the following conditions does a shock wave occur?

a) when two waves of differing frequencies superpose

b) when the temperature of air is greater than the temperature of the source of the sound

c) when the pressure amplitude exceeds the maximum pressure amplitude that the human ear can tolerate

d) when the source of a sound wave exceeds the speed of sound

e) when the sound intensity level exceeds 130 dB