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Conceptual Physics | 12th Edition | ISBN: 9780321909107 | Authors: Paul G. Hewitt

Conceptual Physics 12th Edition solutions

Author: Paul G. Hewitt
Publisher: Pearson
ISBN: 9780321909107
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Chapter 12 Problems

Chapter: 12 Problem: 88TAD

Conceptual Physics 12
Ultrasonic waves have many applications in technology and medicine. One advantage is that large intensities can be used without danger to the ear. Cite another advantage of their short wavelength. (Hint: Why do microscopists use blue light rather than white light to see detail?)

Chapter: 12 Problem: 89TAD

Conceptual Physics 12
A rule of thumb for estimating the distance in kilometers between an observer and a lightning stroke is to divide the number of seconds in the interval between the flash and the sound by 3. Is this rule correct? Discuss the reason for its correctness or incorrectness.

Chapter: 12 Problem: 90TAD

Conceptual Physics 12
A pair of loudspeakers on two sides of a stage are emitting identical pure tones (tones of a fixed frequency and fixed wavelength in air). When you stand in the center aisle, equally distant from the two speakers, you hear the sound loud and clear. Why does the intensity of the sound diminish conside

Chapter: 12 Problem: 91TAD

Conceptual Physics 12
When two out-of-phase speakers are brought together as shown in Figure 20.19, which waves are most canceled: long waves or short waves? Defend and discuss your answer.

Chapter: 12 Problem: 1RCQ

Conceptual Physics 12
How does sound relate to energy?

Chapter: 12 Problem: 2RCQ

Conceptual Physics 12
What is the relationship between frequency and pitch?

Chapter: 12 Problem: 3RCQ

Conceptual Physics 12
What is the average range of a young persons hearing?

Chapter: 12 Problem: 4RCQ

Conceptual Physics 12
Distinguish between infrasonic and ultrasonic sound waves.

Chapter: 12 Problem: 5RCQ

Conceptual Physics 12
Relative to solids and liquids, how does air rank as a conductor of sound?

Chapter: 12 Problem: 6RCQ

Conceptual Physics 12
Why doesnt sound travel in a vacuum?

Chapter: 12 Problem: 7RCQ

Conceptual Physics 12
Distinguish between a compression and a rarefaction.

Chapter: 12 Problem: 9RCQ

Conceptual Physics 12
What factors does the speed of sound depend upon? What are some factors that it does not depend upon?

Chapter: 12 Problem: 8RCQ

Conceptual Physics 12
Do compressions and rarefactions travel in the same direction, or in opposite directions, in a wave?

Chapter: 12 Problem: 10RCQ

Conceptual Physics 12
What is the speed of sound in dry air at \(20^{\circ}\)?

Chapter: 12 Problem: 11RCQ

Conceptual Physics 12
Does sound travel faster in warm air than in cold air?

Chapter: 12 Problem: 12RCQ

Conceptual Physics 12
Which is normally greater: the energy in ordinary sound or the energy in ordinary light?

Chapter: 12 Problem: 13RCQ

Conceptual Physics 12
What ultimately becomes of the energy of sound in the air?

Chapter: 12 Problem: 14RCQ

Conceptual Physics 12
What is an echo?

Chapter: 12 Problem: 15RCQ

Conceptual Physics 12
What is a reverberation?

Chapter: 12 Problem: 16RCQ

Conceptual Physics 12
What is the cause of refraction?

Chapter: 12 Problem: 17RCQ

Conceptual Physics 12
Does sound tend to bend upward or downward when its speed is less near the ground?

Chapter: 12 Problem: 18RCQ

Conceptual Physics 12
Why does sound sometimes refract under water?

Chapter: 12 Problem: 19RCQ

Conceptual Physics 12
What is ultrasound?

Chapter: 12 Problem: 20RCQ

Conceptual Physics 12
Why does a struck tuning fork sound louder when it is held against a table?

Chapter: 12 Problem: 21RCQ

Conceptual Physics 12
Give at least two factors that determine the natural frequency of an object.

Chapter: 12 Problem: 22RCQ

Conceptual Physics 12
How do forced vibrations relate to resonance?

Chapter: 12 Problem: 23RCQ

Conceptual Physics 12
When you listen to a radio, why do you hear only one station at a time rather than hearing all stations at once?

Chapter: 12 Problem: 24RCQ

Conceptual Physics 12
How did wind-generated resonance affect the Tacoma Narrows Bridge in Washington in 1940?

Chapter: 12 Problem: 25RCQ

Conceptual Physics 12
When is it possible for one wave to cancel another?

Chapter: 12 Problem: 26RCQ

Conceptual Physics 12
What kind of waves can exhibit interference?

Chapter: 12 Problem: 28RCQ

Conceptual Physics 12
What physical phenomenon underlies the production of beats?

Chapter: 12 Problem: 27RCQ

Conceptual Physics 12
What is the result of a mirror image of a sound signal combining with the sound itself?

Chapter: 12 Problem: 29RCQ

Conceptual Physics 12
What beat frequency will occur when a 370-Hz and a 374-Hz sound source are sounded together?

Chapter: 12 Problem: 30RCQ

Conceptual Physics 12
How does a radio wave differ from a sound wave?

Chapter: 12 Problem: 33TAS

Conceptual Physics 12
What is the wavelength of a 340-Hz tone in room temperature air? What is the wavelength of a 34,000-Hz ultrasonic wave in the same air?

Chapter: 12 Problem: 34TAS

Conceptual Physics 12
For years, marine scientists were mystified by sound waves detected by underwater microphones in the Pacific Ocean. These so-called T-waves were among the purest sounds in nature. Eventually the scientists traced the source to underwater volcanoes, whose rising columns of bubbles resonated like organ

Chapter: 12 Problem: 35TAS

Conceptual Physics 12
An oceanic depth-sounding vessel surveys the ocean bottom with ultrasonic waves that travel at 1530 m/s in seawater. The time delay of the echo to the ocean floor and back is 6 s. Show that the depth of the water directly below the vessel is 4590 m.

Chapter: 12 Problem: 36TAS

Conceptual Physics 12
A bat flying in a cave emits a sound and receives its echo 0.1 s later. Show that its distance from the cave wall is 17 m.

Chapter: 12 Problem: 37TAS

Conceptual Physics 12
You watch distant Sally Homemaker driving nails into a front porch at a regular rate of 1 stroke per second. You hear the sound of the blows exactly synchronized with the blows you see. And then you hear one more blow after you see the hammering stop. Explain how you calculate that Sally is 340 m awa

Chapter: 12 Problem: 38TAS

Conceptual Physics 12
Imagine a Rip van Winkle type who lives in a valley. Just before going to sleep, he yells, WAKE UP, and the sound echoes off the nearest mountain and returns 8 hours later. Show that the distance between Rip and the imaginary mountain is nearly 5000 km (about the distance from New York to San Francis

Chapter: 12 Problem: 39TAS

Conceptual Physics 12
What beat frequencies are possible with tuning forks of frequencies 256, 259, and 261 Hz?

Chapter: 12 Problem: 40TAS

Conceptual Physics 12
A grunting porpoise emits sound at 57 Hz. What is the wavelength of this sound in water, where the speed of sound is 1500 m/s?

Chapter: 12 Problem: 41TAR

Conceptual Physics 12
Rank the speeds of sound through these materials, from greatest to least: a. Air b. Steel c. Water

Chapter: 12 Problem: 42TAR

Conceptual Physics 12
Rank the beat frequencies from highest to lowest for the following pairs of sounds: a. 132 Hz, 136 Hz b. 264 Hz, 258 Hz c. 528 Hz, 531 Hz d. 1056 Hz, 1058 Hz

Chapter: 12 Problem: 43TAE

Conceptual Physics 12
Why dont you hear the sound of distant fireworks until after you see them?

Chapter: 12 Problem: 44TAE

Conceptual Physics 12
If the Moon blew up, why wouldnt we hear it?

Chapter: 12 Problem: 45TAE

Conceptual Physics 12
Why would it be futile to attempt to detect sounds from other planets, even with the very best audio detectors?

Chapter: 12 Problem: 46TAE

Conceptual Physics 12
If you toss a stone in still water, concentric circles are formed. What form will waves have if a stone is tossed into smoothly flowing water?

Chapter: 12 Problem: 47TAE

Conceptual Physics 12
Why do flying bees buzz?

Chapter: 12 Problem: 48TAE

Conceptual Physics 12
A cat can hear sound frequencies up to 70,000 Hz. Bats send and receive ultra-high-frequency squeaks up to 120,000 Hz. Which hears sound of shorter wavelengths: cats or bats?

Chapter: 12 Problem: 49TAE

Conceptual Physics 12
What does it mean to say that a radio station is at 101.1 on your FM dial"?

Chapter: 12 Problem: 50TAE

Conceptual Physics 12
Suppose a sound wave and an electromagnetic wave have the same frequency. Which has the longer wavelength?

Chapter: 12 Problem: 51TAE

Conceptual Physics 12
Sound from source A has twice the frequency of sound from source B. Compare the wavelengths of sound from the two sources.

Chapter: 12 Problem: 53TAE

Conceptual Physics 12
In the stands of a racetrack, you notice smoke from the starters gun before you hear the gun fire. Explain.

Chapter: 12 Problem: 52TAE

Conceptual Physics 12
What happens to the wavelength of sound as the frequency increases?

Chapter: 12 Problem: 54TAE

Conceptual Physics 12
In Olympic competition, a microphone detects the sound of the starters gun and sends it electrically to speakers at every runners starting block. Why?

Chapter: 12 Problem: 55TAE

Conceptual Physics 12
When a sound wave moves past a point in air, are there changes in the density of air at this point? Explain.

Chapter: 12 Problem: 56TAE

Conceptual Physics 12
At the instant that a high-pressure region is created just outside the prongs of a vibrating tuning fork, what is being created inside between the prongs?

Chapter: 12 Problem: 57TAE

Conceptual Physics 12
Why is it so quiet after a snowfall?

Chapter: 12 Problem: 58TAE

Conceptual Physics 12
If a bell is ringing inside a bell jar, we can no longer hear it when the air is evacuated, but we can still see it. What differences in the properties of sound and light does this indicate?

Chapter: 12 Problem: 59TAE

Conceptual Physics 12
Why is the Moon described as a silent planet?

Chapter: 12 Problem: 60TAE

Conceptual Physics 12
If the speed of sound were dependent on its frequency, would you enjoy a concert sitting in the second balcony? Explain.

Chapter: 12 Problem: 61TAE

Conceptual Physics 12
If the frequency of sound is doubled, what change will occur in its speed? In its wavelength?

Chapter: 12 Problem: 62TAE

Conceptual Physics 12
Why does sound travel slower in cold air than in warm air?

Chapter: 12 Problem: 63TAE

Conceptual Physics 12
Would the refraction of sound be possible if the speed of sound were unaffected by wind, temperature, and other conditions? Defend your answer.

Chapter: 12 Problem: 65TAE

Conceptual Physics 12
What kinds of wind conditions would make sound more easily heard at long distances? Less easily heard at long distances?

Chapter: 12 Problem: 64TAE

Conceptual Physics 12
Why can the tremor of the ground from a distant explosion be felt before the sound of the explosion can be heard?

Chapter: 12 Problem: 66TAE

Conceptual Physics 12
If the distance from a bugle is tripled, by what factor does the sound intensity decrease? Assume that no reflections affect the sound.

Chapter: 12 Problem: 67TAE

Conceptual Physics 12
Why is an echo weaker than the original sound?

Chapter: 12 Problem: 68TAE

Conceptual Physics 12
If a single disturbance at an unknown distance emits both transverse and longitudinal waves that travel with distinctly different speeds in the medium, such as in the ground during an earthquake, how can the distance to the disturbance be determined?

Chapter: 12 Problem: 69TAE

Conceptual Physics 12
What two physics mistakes occur in a science fiction movie that shows a distant explosion in outer space and you see and hear the explosion at the same time?

Chapter: 12 Problem: 70TAE

Conceptual Physics 12
Why will marchers at the end of a long parade following a band be out of step with marchers near the front?

Chapter: 12 Problem: 71TAE

Conceptual Physics 12
Why is it a sensible procedure for soldiers to break step when marching over a bridge?

Chapter: 12 Problem: 72TAE

Conceptual Physics 12
Why is the sound of a harp soft in comparison with the sound of a piano?

Chapter: 12 Problem: 73TAE

Conceptual Physics 12
Your classmate says that the speed of sound and the frequency of sound depend on the medium in which the sound travels. What part of this statement do you disagree with?

Chapter: 12 Problem: 75TAE

Conceptual Physics 12
The sitar, an Indian musical instrument, has a set of strings that vibrate and produce music, even though they are never plucked by the player. These sympathetic strings are identical to the plucked strings and are mounted below them. What is your explanation?

Chapter: 12 Problem: 74TAE

Conceptual Physics 12
Apartment dwellers will testify that bass notes are more distinctly heard from music played in nearby apartments. Why do you suppose lower-frequency sounds travel through walls, floors, and ceilings more easily than high frequency sounds?

Chapter: 12 Problem: 76TAE

Conceptual Physics 12
Why does a dance floor heave only when certain kinds of dance steps are being performed?

Chapter: 12 Problem: 77TAE

Conceptual Physics 12
A special device can transmit out-of-phase sound from a noisy jackhammer to its operator using earphones. Over the noise of the jackhammer, the operator can easily hear your voice while you are unable to hear his. Explain.

Chapter: 12 Problem: 78TAE

Conceptual Physics 12
An object resonates when the frequency of a vibrating force either matches its natural frequency or is a submultiple of its natural frequency. Why wont it resonate to multiples of its natural frequency? (Hint: Think of pushing a child in a swing.)

Chapter: 12 Problem: 79TAE

Conceptual Physics 12
How can a certain note sung by a singer cause a crystal glass to shatter?

Chapter: 12 Problem: 80TAE

Conceptual Physics 12
Are beats the result of interference, of the Doppler effect, or of both?

Chapter: 12 Problem: 81TAE

Conceptual Physics 12
Is it correct to say that beats of sound are much the same thing as the rhythmic beat of music? Defend your answer.

Chapter: 12 Problem: 82TAE

Conceptual Physics 12
Two sound waves of the same frequency can interfere, but, in order to produce beats, the two sound waves must have different frequencies. Why?

Chapter: 12 Problem: 83TAE

Conceptual Physics 12
Suppose a piano tuner hears 3 beats per second when listening to the combined sound from a tuning fork and the piano wire being tuned. After slightly tightening the string, 5 beats per second are heard. Should the string be loosened or tightened?

Chapter: 12 Problem: 84TAE

Conceptual Physics 12
A piano tuner using a 264-Hz tuning fork hears 4 beats per second. What are two possible frequencies of vibration of the piano wire?

Chapter: 12 Problem: 86TAD

Conceptual Physics 12
As you pour water into a glass, you repeatedly tap the glass with a spoon. As the tapped glass is being filled, does the pitch of the sound increase or decrease? (Discuss what you should do to answer this question.)

Chapter: 12 Problem: 85TAE

Conceptual Physics 12
A human cannot hear sound at a frequency of 100 kHz or sound at 102 kHz. But if you walk into a room in which two sources are emitting sound waves, one at 100 kHz and the other at 102 kHz, youll hear sound. Explain.

Chapter: 12 Problem: 87TAD

Conceptual Physics 12
Discuss why sound travels faster in moist air. (Note that at the same temperature, water vapor molecules have the same average kinetic energy as the heavier nitrogen and oxygen molecules in the air.) How, then, do the average speeds of \(H_2O\) molecules compare with the speeds of \(N_2\) and \(O_2\)

Chapter: 12 Problem: 1E

Conceptual Physics 12
Why do you not hear the sound of distant fireworks until after you see them?

Chapter: 12 Problem: 1P

Conceptual Physics 12
Problem 1P What is the wavelength of a 340-Hz tone in air? What is the wavelength of a 34,000-Hz ultrasonic wave in air?

Chapter: 12 Problem: 1R

Conceptual Physics 12
Problem 1R Rank the speed of sound through the following from greatest to least: a. Air b. Steel c. Water

Chapter: 12 Problem: 1RQ

Conceptual Physics 12
Problem 1RQ How does a physicist usually define sound?

Chapter: 12 Problem: 2E

Conceptual Physics 12
Problem 2E If the Moon blew up, why would we not hear it?

Chapter: 12 Problem: 2P

Conceptual Physics 12
Problem 2P For years, marine scientists were mystified by sound waves detected by underwater microphones in the Pacific Ocean. These so-called T-waves were among the purest sounds in nature. Eventually they traced the source to underwater volcanoes, whose rising column

Chapter: 12 Problem: 2R

Conceptual Physics 12
Problem 2R Rank the beat frequency from highest to lowest for the following pairs of sounds: a. 132 Hz, 136 Hz b. 264 Hz, 258 Hz c. 528 Hz, 531 Hz d. 1056 Hz, 1058 Hz

Chapter: 12 Problem: 2RQ

Conceptual Physics 12
What is the relationship between frequency and pitch?

Chapter: 12 Problem: 3E

Conceptual Physics 12
Problem 3E Why would it be futile to attempt to detect sounds from other planets, even given the very best in audio detectors?

Chapter: 12 Problem: 3P

Conceptual Physics 12
Problem 3P An oceanic depth-sounding vessel surveys the ocean bottom with ultrasonic waves that travel 1530 m/s in seawater. The time delay of the echo to the ocean floor and back is 6 s. Show that the depth of the water directly below the vessel is 4590 m.

Chapter: 12 Problem: 3RQ

Conceptual Physics 12
What is the average range of a young persons hearing?

Chapter: 12 Problem: 4E

Conceptual Physics 12
Problem 4E If you toss a stone in still water, concentric circles are formed. What form will waves have if a stone is tossed into smoothly flowing water?

Chapter: 12 Problem: 4P

Conceptual Physics 12
Problem 4P A bat flying in a cave emits a sound and receives its echo 0.1 s later. Show that its distance from the cave wall is 19 m.

Chapter: 12 Problem: 4RQ

Conceptual Physics 12
Problem 4RQ Distinguish between? nfrasonic? and ?ultrasonic? sound waves.

Chapter: 12 Problem: 5E

Conceptual Physics 12
Problem 5E Why do flying bees buzz?

Chapter: 12 Problem: 5P

Conceptual Physics 12
Problem 5P You watch distant Sally Homemaker driving nails into a front porch at a regular rate of 1 stroke per second. You hear the sound of the blows exactly synchronized with the blows you see. And then you hear one more blow after you see the hammering stop. Explai

Chapter: 12 Problem: 5RQ

Conceptual Physics 12
Problem 5RQ Distinguish between a ?compression? and a ?rarefaction.

Chapter: 12 Problem: 6E

Conceptual Physics 12
Problem 6E A cat can hear sound frequencies up to 70,000 Hz. Bats send and receive ultra-high-frequency squeaks up to 120,000 Hz. Which hears sound of shorter wavelengths, cats or bats?

Chapter: 12 Problem: 6P

Conceptual Physics 12
Problem 6P Imagine a Rip van Winkle type who lives in the mountains. Just before going to sleep, he yells, WAKE UP, and the sound echoes off the nearest mountain and returns 8 hours later. Show that the distance between Rip and the imaginary mountain is nearly 5000 km

Chapter: 12 Problem: 6RQ

Conceptual Physics 12
Problem 6RQ Cite evidence to support the fact that compressions and rarefactions travel in the same direction in a wave.

Chapter: 12 Problem: 7E

Conceptual Physics 12
Problem 7E What does it mean to say that a radio station is at 101.1 on your FM dial?

Chapter: 12 Problem: 7P

Conceptual Physics 12
Problem 7P What beat frequencies are possible with tuning forks of frequencies 256, 259, and 261 Hz?

Chapter: 12 Problem: 7RQ

Conceptual Physics 12
Problem 7RQ Relative to solids and liquids, how does air rank as a conductor of sound?

Chapter: 12 Problem: 8E

Conceptual Physics 12
Problem 8E Suppose a sound wave and an electromagnetic wave have the same frequency. Which has the longer wavelength?

Chapter: 12 Problem: 8P

Conceptual Physics 12
A grunting porpoise emits sound at 57 Hz. What is the wavelength of this sound in water, where the speed of sound is 1500 m/s?

Chapter: 12 Problem: 8RQ

Conceptual Physics 12
Problem 8RQ Why will sound not travel in a vacuum?

Chapter: 12 Problem: 9E

Conceptual Physics 12
Problem 9E Sound from source A has twice the frequency of sound from source B. Compare the wavelengths of sound from the two sources.

Chapter: 12 Problem: 9RQ

Conceptual Physics 12
Problem 9RQ What factors does the speed of sound depend upon? What are some factors that it does ?not? depend upon?

Chapter: 12 Problem: 10E

Conceptual Physics 12
Problem 10E What happens to the wavelength of sound as the frequency increases?

Chapter: 12 Problem: 10RQ

Conceptual Physics 12
Problem 10RQ What is the speed of sound in dry air at 0C?

Chapter: 12 Problem: 11E

Conceptual Physics 12
Problem 11E In the stands of a racetrack, you notice smoke from the starters gun before you hear it fire. Explain.

Chapter: 12 Problem: 11RQ

Conceptual Physics 12
Problem 11RQ Does sound travel faster in warm air than in cold air? Defend your answer.

Chapter: 12 Problem: 12E

Conceptual Physics 12
Problem 12E In Olympic competition, a microphone detects the sound of the starters gun and sends it electrically to speakers at every runners starting block. Why?

Chapter: 12 Problem: 12RQ

Conceptual Physics 12
Problem 12RQ What is an ?echo??

Chapter: 12 Problem: 13E

Conceptual Physics 12
Problem 13E When a sound wave moves past a point in air, are there changes in the density of air at this point? Explain.

Chapter: 12 Problem: 13RQ

Conceptual Physics 12
Problem 13RQ What is a ?reverberation??

Chapter: 12 Problem: 14E

Conceptual Physics 12
Problem 14E At the instant that a high-pressure region is created just outside the prongs of a vibrating tuning fork, what is being created inside between the prongs?

Chapter: 12 Problem: 14RQ

Conceptual Physics 12
Problem 14RQ What is the cause of refraction?

Chapter: 12 Problem: 15E

Conceptual Physics 12
Problem 15E Why is it so quiet after a snowfall?

Chapter: 12 Problem: 15RQ

Conceptual Physics 12
Problem 15RQ Does sound tend to bend upward or downward when its speed is less near the ground?

Chapter: 12 Problem: 16E

Conceptual Physics 12
Problem 16E If a bell is ringing inside a bell jar, we can no longer hear it when the air is evacuated, but we can still see it. What differences in the properties of sound and light does this indicate?

Chapter: 12 Problem: 16RQ

Conceptual Physics 12
Problem 16RQ Why does sound sometimes refract under water?

Chapter: 12 Problem: 17E

Conceptual Physics 12
Problem 17E Why is the Moon described as a silent planet?

Chapter: 12 Problem: 17RQ

Conceptual Physics 12
Which is normally greater, the energy in ordinary sound or the energy in ordinary light?

Chapter: 12 Problem: 18E

Conceptual Physics 12
Problem 18E As you pour water into a glass, you repeatedly tap the glass with a spoon. As the tapped glass is being filled, does the pitch of the sound increase or decrease? (What should you do to answer this question?)

Chapter: 12 Problem: 18RQ

Conceptual Physics 12
Problem 18RQ What ultimately becomes of the energy of sound in the air?

Chapter: 12 Problem: 19E

Conceptual Physics 12
Problem 19E If the speed of sound were dependent on its frequency, would you enjoy a concert sitting in the second balcony? Explain.

Chapter: 12 Problem: 19RQ

Conceptual Physics 12
Why does a struck tuning fork sound louder when it is held against a table?

Chapter: 12 Problem: 20E

Conceptual Physics 12
If the frequency of sound is doubled, what change will occur in its speed? In its wavelength?

Chapter: 12 Problem: 20RQ

Conceptual Physics 12
Problem 20RQ Give at least two factors that determine the natural frequency of an object.

Chapter: 12 Problem: 21E

Conceptual Physics 12
Problem 21E Why does sound travel slower in cold air?

Chapter: 12 Problem: 21RQ

Conceptual Physics 12
Problem 21RQ How do forced ?vibrations? relate to ?resonance??

Chapter: 12 Problem: 22E

Conceptual Physics 12
Problem 22E Why does sound travel faster in moist air? (?Hint:? At the same temperature, water vapor molecules have the same average kinetic energy as the heavier nitrogen and oxygen molecules in the air. How, then, do the average speeds of H2O molecules compare with t

Chapter: 12 Problem: 22RQ

Conceptual Physics 12
Problem 22RQ When you listen to a radio, why do you hear only one station at a time rather than hearing all stations at once?

Chapter: 12 Problem: 23E

Conceptual Physics 12
Would the refraction of sound be possible if the speed of sound were unaffected by wind, temperature, and other conditions? Defend your answer.

Chapter: 12 Problem: 23RQ

Conceptual Physics 12
Problem 23RQ How did wind-generated resonance affect the Tacoma Narrows Bridge in the stare of Washington in 1940?

Chapter: 12 Problem: 24E

Conceptual Physics 12
Problem 24E Why can the tremor of the ground from a distant explosion be felt before the sound of the explosion can be heard?

Chapter: 12 Problem: 24RQ

Conceptual Physics 12
Problem 24RQ When is it possible for one wave to cancel another?

Chapter: 12 Problem: 25E

Conceptual Physics 12
Problem 25E What kinds of wind conditions would make sound more easily heard at long distances? Less easily heard at long distances?

Chapter: 12 Problem: 25RQ

Conceptual Physics 12
Problem 25RQ What kind of waves can exhibit interference?

Chapter: 12 Problem: 26E

Conceptual Physics 12
Problem 26E Ultrasonic waves have many applications in technology and medicine. One advantage is that large intensities can be used without danger to the ear. Cite another advantage of their short wavelength. (?Hint:? Why do microscopists use blue light rather than whi

Chapter: 12 Problem: 26RQ

Conceptual Physics 12
What physical phenomenon underlies the production of beats?

Chapter: 12 Problem: 27E

Conceptual Physics 12
Problem 27E If the distance from a bugle is tripled, by what factor does the sound intensity decrease? Assume that no reflections affect the sound.

Chapter: 12 Problem: 27RQ

Conceptual Physics 12
Problem 27RQ What beat frequency will occur when a 370-Hz and a 374-Hz sound source are sounded together?

Chapter: 12 Problem: 28E

Conceptual Physics 12
Problem 28E Why is an echo weaker than the original sound?

Chapter: 12 Problem: 28RQ

Conceptual Physics 12
Problem 28RQ How does a radio wave differ from a sound wave?

Chapter: 12 Problem: 29E

Conceptual Physics 12
Problem 29E What two physics mistakes occur in a science fiction movie that shows a distant explosion in outer space, where you see and hear the explosion at the same time?

Chapter: 12 Problem: 30E

Conceptual Physics 12
Problem 30E A rule of thumb for estimating the distance in kilometers between an observer and a lightning stroke is to divide the number of seconds in the interval between the flash and the sound by 3. Is this rule correct? Defend your answer.

Chapter: 12 Problem: 31E

Conceptual Physics 12
If a single disturbance at an unknown distance emits both transverse and longitudinal waves that travel with distinctly different speeds in the medium, such as in the ground during an earthquake, how can the distance to the disturbance be determined?

Chapter: 12 Problem: 32E

Conceptual Physics 12
Problem 32E Why will marchers at the end of a long parade following a band be out of step with marchers near the front?

Chapter: 12 Problem: 33E

Conceptual Physics 12
Problem 33E Why is it a sensible procedure for soldiers to break step when marching over a bridge?

Chapter: 12 Problem: 34E

Conceptual Physics 12
Problem 34E Why is the sound of a harp soft in comparison with the sound of a piano?

Chapter: 12 Problem: 35E

Conceptual Physics 12
Problem 35E Your classmate says that the speed of sound and the frequency of sound depend on the medium in which it travels. What part of this statement do you disagree with?

Chapter: 12 Problem: 36E

Conceptual Physics 12
Problem 36E Apartment dwellers will testify that bass notes are more distinctly heard from music played in nearby apartments. Why do you suppose lower-frequency sounds travel through walls, floors, and ceilings more easily?

Chapter: 12 Problem: 37E

Conceptual Physics 12
Problem 37E The sitar, an Indian musical instrument, has a set of strings that vibrate and produce music, even though they are never plucked by the player. These sympathetic strings are identical to the plucked strings and are mounted below them. What is your explanati

Chapter: 12 Problem: 38E

Conceptual Physics 12
Problem 38E Why does a dance floor heave only when certain kinds of dance steps are being performed?

Chapter: 12 Problem: 39E

Conceptual Physics 12
Problem 39E A pair of loudspeakers on two sides of a stage are emitting identical pure tones (tones of a fixed frequency and fixed wavelength in air). When you stand in the center aisle, equally distant from the two speakers, you hear the sound loud and clear. Why does

Chapter: 12 Problem: 40E

Conceptual Physics 12
Problem 40E A special device can transmit out-of-phase sound from a noisy jackhammer to its operator using earphones. Over the noise of the jackhammer, the operator can easily hear your voice while you are unable to hear his. Explain.

Chapter: 12 Problem: 41E

Conceptual Physics 12
Problem 41E When two out-of-phase speakers are brought together as shown in Figure 20.19, which waves are most canceled, long waves or short waves? Why?

Chapter: 12 Problem: 42E

Conceptual Physics 12
Problem 42E An object resonates when the frequency of a vibrating force cither matches its natural frequency or is a submultiple of its natural frequency. Why will it not resonate to multiples of its natural frequency? (?Hint:? Think of pushing a child in a swing.)

Chapter: 12 Problem: 43E

Conceptual Physics 12
Problem 43E How can a certain note sung by a singer cause a crystal glass to shatter?

Chapter: 12 Problem: 44E

Conceptual Physics 12
Problem 44E Are beats the result of interference or of the Doppler effect, or of both?

Chapter: 12 Problem: 45E

Conceptual Physics 12
Problem 45E Can it correctly be said that beats of sound are much the same thing as the rhythmic beat of music? Defend your answer.

Chapter: 12 Problem: 46E

Conceptual Physics 12
Problem 46E Two sound waves of the same frequency can interfere, but, in order to produce beats, the two sound waves must be of different frequencies. Why?

Chapter: 12 Problem: 47E

Conceptual Physics 12
Problem 47E Walking beside you, your friend takes 50 strides per minute while you take 48 strides per minute. If you start in step, youll soon be out of step. When will you be in step again?

Chapter: 12 Problem: 48E

Conceptual Physics 12
Problem 48E Suppose a piano tuner hears 3 beats per second when listening to the combined sound from a tuning fork and the piano wire being tuned. After slightly tightening the string, 5 beats per second are heard. Should the string be loosened or tightened?

Chapter: 12 Problem: 49E

Conceptual Physics 12
Problem 49E A piano tuner using a 264-Hz tuning fork hears 4 beats per second. What are two possible frequencies of vibration of the piano wire?

Chapter: 12 Problem: 50E

Conceptual Physics 12
Problem 50E A human cannot hear sound at a frequency of 100 kHz or sound at 102 kHz. But if you walk into a room in which two sources are emitting sound waves, one at 100 kHz and the other at 102 kHz, youll hear sound. Explain.

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