University Physics Volume 1
18th Edition
ISBN: 9781938168277
Author: William Moebs, Samuel J. Ling, Jeff Sanny
Publisher: OpenStax - Rice University
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Textbook Question
Chapter 17, Problem 80P
The ear canal resonates like a tube closed at one end. (See [link]Figure 17_03_HumEar[/link].) If ear canals range in length from 1.80 to 2.60 cm in an average population, what is the range of fundamental resonant frequencies? Take air temperature to be 37.0°C, which is the same as body temperature.
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The ear canal resonates like a tube closed at one end. (See [link]Figure 17_03_HumEar[/link].) If ear canals range in length from 1.80 to 2.60 cm in an average population, what is the range of fundamental resonant frequencies? Take air temperature to be 37.0°C, which is the same as body temperature.
If ear canals range in length from 0.018 to 0.026 m in an average population, what is the range of
fundamental resonant frequencies? Take air temperature to be 37 C, which is the same as body
temperature.
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Sound waves travel at roughly 340 m/s at room temperature. The minimum hearing range of a human is 20Hz. a) What is the wavelength of this wave? b) Could this wavelength fit inside the dimensions of Room 411( room dimensions are roughly 11.5 m x 8.7 m)? Justify your answer with sound reasoning (pun intended :-))
Chapter 17 Solutions
University Physics Volume 1
Ch. 17 - Check Your Understanding Imagine you observe two...Ch. 17 - Check Your Understanding Identify common sounds at...Ch. 17 - Check Your Understanding Describe how amplitude is...Ch. 17 - Check Your Understanding If you walk around two...Ch. 17 - Check Your Understanding Describe how...Ch. 17 - Check Your Understanding How is it possible to use...Ch. 17 - Check Your Understanding You observe two musical...Ch. 17 - Check Your Understanding What would happen if more...Ch. 17 - Check Your Understanding Describe a situation in...Ch. 17 - What is the difference between sound and hearing?
Ch. 17 - You will learn that light is an electromagnetic...Ch. 17 - Sound waves can be modeled as a change in...Ch. 17 - How do sound vibrations of atoms differ from...Ch. 17 - When sound passes from one medium to another where...Ch. 17 - A popular party trick is to inhale helium and...Ch. 17 - You may have used a sonic range finder in lab to...Ch. 17 - The sonic range finder discussed in the preceding...Ch. 17 - Six members of a synchronized swim team wear...Ch. 17 - A community is concerned about a plan to bring...Ch. 17 - You are given two wind instruments of identical...Ch. 17 - What is the difference between an overtone and a...Ch. 17 - Two identical columns, open at both ends, are in...Ch. 17 - How does an unamplified guitar produce sounds so...Ch. 17 - Consider three pipes of the same length (L). Pipe...Ch. 17 - Pipe A has a length L and is open at both ends....Ch. 17 - A string is tied between two lab posts a distance...Ch. 17 - Two speakers are attached to variable-frequency...Ch. 17 - The label has been scratched off a tuning fork and...Ch. 17 - Referring to the preceding question, if you had...Ch. 17 - A “showy” custom-built car has two brass horns...Ch. 17 - Is the Doppler shift real or just a sensory...Ch. 17 - Three stationary observers observe the Doppler...Ch. 17 - Shown below is a stationary source and moving...Ch. 17 - Prior to 1980, conventional radar was used by...Ch. 17 - What is the difference between a sonic boom and a...Ch. 17 - Due to efficiency considerations related to its...Ch. 17 - When you hear a sonic boom, you often cannot see...Ch. 17 - Consider a sound wave modeled with the equation...Ch. 17 - Consider a sound wave moving through the air...Ch. 17 - Consider a diagnostic ultrasound of frequency 5.00...Ch. 17 - A sound wave is modeled as...Ch. 17 - A sound wave is modeled with the wave function...Ch. 17 - The displacement of the air molecules in sound...Ch. 17 - A speaker is placed at the opening of a long...Ch. 17 - A 250-Hz tuning fork is struck and begins to...Ch. 17 - A sound wave produced by an ultrasonic transducer,...Ch. 17 - Porpoises emit sound waves that they use for...Ch. 17 - Bats use sound waves to catch insects. Bats can...Ch. 17 - A bat sends of a sound wave 100 kHz and the sound...Ch. 17 - Consider the graph shown below of a compression...Ch. 17 - Consider the graph in the preceding problem of a...Ch. 17 - A guitar string oscillates at a frequency of 100...Ch. 17 - When poked by a spear, an operatic soprano lets...Ch. 17 - What frequency sound has a 0.10-m wavelength when...Ch. 17 - Calculate the speed of sound on a day when a...Ch. 17 - (a) What is the speed of sound in a medium where a...Ch. 17 - Show that the speed of sound in 20.0°C air is 343...Ch. 17 - Air temperature in the Sahara Desert can reach...Ch. 17 - Dolphins make sounds in air and water. What is the...Ch. 17 - A sonar echo returns to a submarine 1.20 s after...Ch. 17 - (a) If a submarine’s sonar can measure echo times...Ch. 17 - Ultrasonic sound waves are often used in methods...Ch. 17 - A physicist at a fireworks display times the lag...Ch. 17 - During a 4th of July celebration, an M80 firework...Ch. 17 - The density of a sample of water is =998.00kg/m3...Ch. 17 - Suppose a bat uses sound echoes to locate its...Ch. 17 - What is the intensity in watts per meter squared...Ch. 17 - The warning tag on a lawn mower states that it...Ch. 17 - A sound wave traveling in air has a pressure...Ch. 17 - What intensity level does the sound in the...Ch. 17 - What sound intensity level in dB is produced by...Ch. 17 - What is the decibel level of a sound that is twice...Ch. 17 - What is the intensity of a sound that has a level...Ch. 17 - People with good hearing can perceive sounds as...Ch. 17 - If a large housefly 3.0 m away from you makes a...Ch. 17 - Ten cars in a circle at a boom box competition...Ch. 17 - The amplitude of a sound wave is measured in terms...Ch. 17 - If a sound intensity level of 0 dB at 1000 Hz...Ch. 17 - An 8-hour exposure to a sound intensity level of...Ch. 17 - Sound is more effectively transmitted into a...Ch. 17 - Loudspeakers can produce intense sounds with...Ch. 17 - The factor of 10-12 in the range of intensities to...Ch. 17 - What are the closest frequencies to 500 Hz that an...Ch. 17 - YY13Can you tell that your roommate turned up the...Ch. 17 - If a woman needs an amplification of 5.0105 times...Ch. 17 - A person has a hearing threshold 10 dB above...Ch. 17 - (a) What is the fundamental frequency of a...Ch. 17 - What is the length of a tube that has a...Ch. 17 - The ear canal resonates like a tube closed at one...Ch. 17 - Calculate the first overtone in an ear canal,...Ch. 17 - A crude approximation of voice production is to...Ch. 17 - A 4.0-m-long pipe, open at one end and closed at...Ch. 17 - A 4.0-m-long pipe, open at both ends, is placed in...Ch. 17 - A nylon guitar string is fixed between two lab...Ch. 17 - A 512-Hz tuning fork is struck and placed next to...Ch. 17 - Students in a physics lab are asked to find the...Ch. 17 - If a wind instrument, such as a tuba, has a...Ch. 17 - What are the first three overtones of a bassoon...Ch. 17 - How long must a flute be in order to have a...Ch. 17 - What length should an oboe have to produce a...Ch. 17 - (a) Find the length of an organ pipe closed at one...Ch. 17 - An organ pipe (L=3.00m) is closed at both ends....Ch. 17 - An organ pipe (L=3.00m) is closed at one end....Ch. 17 - A sound wave of a frequency of 2.00 kHz is...Ch. 17 - Consider the sound created by resonating the tube...Ch. 17 - A student holds an 80.00-cm lab pole one quarter...Ch. 17 - A string on the violin has a length of 24.00 cm...Ch. 17 - By what fraction will the frequencies produced by...Ch. 17 - What beat frequencies are present: (a) If the...Ch. 17 - What beat frequencies result if a piano hammer...Ch. 17 - A piano tuner hears a beat every 2.00 s when...Ch. 17 - Two identical strings, of identical lengths of...Ch. 17 - A piano tuner uses a 512-Hz tuning fork to tune a...Ch. 17 - A string with a linear mass density of =0.0062...Ch. 17 - A car has two horns, one emitting a frequency of...Ch. 17 - The middle C hammer of a piano hits two strings,...Ch. 17 - Two tuning forks having frequencies of 460 and 464...Ch. 17 - Twin jet engines on an airplane are producing an...Ch. 17 - Three adjacent keys on a piano (F, F-sharp, and G)...Ch. 17 - (a) What frequency is received by a person...Ch. 17 - (a) At an air show a jet flies directly toward the...Ch. 17 - What frequency is received by a mouse just before...Ch. 17 - A spectator at a parade receives an 888-Hz tone...Ch. 17 - A commuter train blows its 200-Hz horn as it...Ch. 17 - Can you perceive the shift in frequency produced...Ch. 17 - Two eagles fly directly toward one another, the...Ch. 17 - Student A runs down the hallway of the school at a...Ch. 17 - An ambulance with a siren (f=1.00kHz) blaring is...Ch. 17 - The frequency of the siren of an ambulance is 900...Ch. 17 - What is the minimum speed at which a source must...Ch. 17 - An airplane is flying at Mach 1.50 at an altitude...Ch. 17 - A jet flying at an altitude of 8.50 km has a speed...Ch. 17 - The shock wave off the front of a fighter jet has...Ch. 17 - A plane is flying at Mach 1.2, and an observer on...Ch. 17 - A bullet is fired and moves at a speed of 1342...Ch. 17 - A speaker is placed at the opening of a long...Ch. 17 - An airplane moves at Mach 1.2 and produces a shock...Ch. 17 - A 0.80-m-long tube is opened at both ends. The air...Ch. 17 - A tube filled with water has a valve at the bottom...Ch. 17 - Consider the following figure. The length of the...Ch. 17 - Early Doppler shift experiments were conducted...Ch. 17 - Two cars move toward one another, both sounding...Ch. 17 - Student A runs after Student B. Student A carries...Ch. 17 - Suppose that the sound level from a source is 75...Ch. 17 - The Doppler shift for a Doppler radar is found by...Ch. 17 - A stationary observer hears a frequency of 1000.00...Ch. 17 - A flute plays a note with a frequency of 600 Hz....Ch. 17 - Two sound speakers are separated by a distance d,...Ch. 17 - Consider the beats shown below. This is a graph of...Ch. 17 - Two speakers producing the same frequency of sound...Ch. 17 - A string has a length of 1.5 m, a linear mass...Ch. 17 - A string (=0.006kgm,L=1.50m) is fixed at both ends...Ch. 17 - A string has a linear mass density µ, a length L,...Ch. 17 - A string has a linear mass density =0.007 kg/m, a...Ch. 17 - A speaker powered by a signal generator is used to...Ch. 17 - A string on the violin has a length of 23.00 cm...
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- Some studies suggest that the upper frequency limit of hearing is determined by the diameter of the eardrum. The wavelength of the sound wave and the diameter of the eardrum are approximately equal at this upper limit. If the relationship holds exactly, what is the diameter of the eardrum of a person capable of hearing 20 000 Hz? (Assume a body temperature of 37.0C.)arrow_forwardThe area of a typical eardrum is about 5.00 X 10-5 m2. (a) (Calculate the average sound power incident on an eardrum at the threshold of pain, which corresponds to an intensity of 1.00 W/m2. (b) How much energy is transferred to the eardrum exposed to this sound lor 1.00 mill?arrow_forwardBased on the graph in Figure 17.36, what is the threshold of hearing in decibels for frequencies of 60, 400, 1000, 4000, and 15,000 Hz? Note that many AC electrical appliances produce 60 Hz, music is commonly 400 Hz, a reference frequency is 1000 Hz, your maximum sensitivity is near 4000 Hz, and many older TVs produce a 15,750 Hz whine. Figure 17.36 The relationship of loudness in phons to intensity level (in decibels) and intensity (in watts per meter squared) for persons with normal hearing. The curved lines are equal-loudness curves—all sounds on a given curve are perceived as equally loud. Phons and decibels are defined to be the same at 1000 Hz.arrow_forward
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