University Physics Volume 1
18th Edition
ISBN: 9781938168277
Author: William Moebs, Samuel J. Ling, Jeff Sanny
Publisher: OpenStax - Rice University
expand_more
expand_more
format_list_bulleted
Concept explainers
Textbook Question
Chapter 17, Problem 115P
A commuter train blows its 200-Hz horn as it approaches a crossing. The speed of sound is 335 m/s. (a) An observer waiting at the crossing receives a frequency of 208 Hz. What is the speed of the train? (b) What frequency does the observer receive as the train moves away?
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
An alert physics student stands beside the tracks as a train rolls slowly past. He notes that the frequency of the train whistle is 461 Hz when the train is approaching him and 441 Hz when the train is receding from him. Using these frequencies, he calculates the speed of the train. What value does he find? (Assume the speed of sound in air is 343 m/s.)
A Truck is traveling at 40 m/s and sounding a siren with 800 Hz when approaching to a car heading towards truck with speed of 1000 cm/s. At what frequency does the driver of the car hear the siren? (Assume a temperature of 20° C and the speed of sound wave in air at this temperature is 343 m/s.)
The siren of a policy car at rest emits a frequency of 1600 Hz. What frequency do you detect if you move with a speed of 40 m/s toward the policy car?
Assume: The Speed of the sound is 344 m/s.
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...
Additional Science Textbook Solutions
Find more solutions based on key concepts
Super-Earth. You’ve discovered a super-Earth orbiting a Sunlike star at the distance of Jupiter. Is it possible...
Life in the Universe (4th Edition)
A mole is approximately the number of protons in a gram of protons. The mass of a neutron is about the same as ...
An Introduction to Thermal Physics
Choose the best answer to each of the following. Explain your reasoning. Planetary orbits are (a) very eccentri...
Cosmic Perspective Fundamentals
A Carnot refrigerator, working between 0 and 30 is used to cool a bucket of water containing 102 m3 of water ...
University Physics Volume 2
The pV-diagram of the Carnot cycle.
Sears And Zemansky's University Physics With Modern Physics
25.33 The circuit shown in Fig. E25.33 contains two batteries, each with an emf and an internal resistance, and...
University Physics with Modern Physics (14th Edition)
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- A train approaches a station platform at a speed of 10 m/s, blowing its whistle at a frequency of 100 Hz, as measured by the engineer. What frequency will be measured by a person on the platform walking in the same direction as the train is moving at 1 m/s? (Assume the velocity of sound is 342 m/s.)arrow_forwardAn elf is moving behind a Orc bard that is singing very loudly and triumphantly. If the Orc is singing at an average frequency of 377 Hz and joyously skipping forward at a speed of 9.3 m/s, how fast would the elf have to be moving and in what direction for the frequency to be heard as 359 Hz? Take the speed of sound to be 340 m/s.arrow_forwardYou are driving down the street with your windows open enjoying the nice day. On this nice 20°C day, the velocity of sound in air is 343 m/s . You see a person sitting on a park bench and hear him whistling just after you drive by. If the person whistles at a frequency of 1450 Hz and you drive away at a speed of 17 m/s, what frequency of sound do you observe?arrow_forward
- What frequency is received by a person watching an oncoming ambulance moving at 100 km/h and emitting a steady 800-Hz sound from its siren? The speed of sound on this day is 700 m/s.arrow_forwardAn alert physics student stands beside the tracks as a train rolls slowly past. He notes that the frequency of the train whistle is 463.0 Hz when the train is approaching him and 440.0 Hz when the train is receding from him. Using these frequencies, he calculates the speed of the train. What value does he find? Assume the speed of sound is 343 m/s.arrow_forwardYou are driving along a highway at 32 m/s when you hear the siren of an emergency vehicle traveling in the opposite direction on the other side of the highway. When the vehicle is approaching you, you hear the frequency of the siren as 2300 Hz, but when it is past you the frequency becomes 1600 Hz. What is the speed of the vehicle? The speed of sound in air is 343 m/s.arrow_forward
- A fire truck emits a sound with frequency of 775Hz a. What is the frequency detected by stationary observer if the fire truck is moving 45m/s towards observer? b. What frequency will be frequency detected if the ambulance is moving 45m/s away from the observer? (the speed of sound in air at 20°C is 343 m/s)arrow_forwardWhat is the frequency a stationary observer hears when a train approaches her with a speed of 30 m/s. The frequency of the train horn is 0.600 kHz and the speed of sound is 340 m/s.arrow_forwardIn this problem take the speed of sound to be 348 m/s. A. How fast, in meters per second, does an observer need to approach a stationary sound source in order to observe a 3.1 % increase in the emitted frequency?arrow_forward
- What frequency of sound is observed if the 444 Hz source is traveling away from a stationary observer at a speed of 30.2 m/s? (assume the speed of sound in air is 343 m/s)arrow_forwardThe driver of a car, who is approaching a siren at a speed of 90 km/h hears a sound with frequency of 520 Hz. Then he reduces the speed of the car and hears a sound with a frequency of 510 Hz. What is the frequency of the sound emitted by the siren? What is the car's new speed?arrow_forwardTwo trains A and B, beep simultaneously with a frequency of 392 Hz. Train A is in rest and train B moves away from train A at a speed of 35 m/s. A listener is among the two trains and moves following train B with a speed of 15 m/s. adopt the speed of sound in air as v = 342 m/s. There is no wind.a) What is the frequency that the listener hears from train B?b) What is the frequency of beats that the listener hears?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
Principles of Physics: A Calculus-Based Text
Physics
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
What Are Sound Wave Properties? | Physics in Motion; Author: GPB Education;https://www.youtube.com/watch?v=GW6_U553sK8;License: Standard YouTube License, CC-BY