![Physics for Scientists and Engineers, Technology Update (No access codes included)](https://www.bartleby.com/isbn_cover_images/9781305116399/9781305116399_largeCoverImage.gif)
Concept explainers
An ultrasonic tape measure uses frequencies above 20 MHz to determine dimensions of structures such as buildings. It does so by emitting a pulse of ultrasound into air and then measuring the time interval for an echo to return from a reflecting surface whose distance away is to be measured. The distance is displayed as a digital readout. For a tape measure that emits a pulse of ultrasound with a frequency of 22.0 MHz., (a) what is the distance to an object from which the echo pulse returns after 24.0 ms when the air temperature is 26°C? (b) What should be the duration of the emitted pulse if it is to include ten cycles of the ultrasonic wave? (c) What is the spatial length of such a pulse?
![Check Mark](/static/check-mark.png)
Trending nowThis is a popular solution!
![Blurred answer](/static/blurred-answer.jpg)
Chapter 17 Solutions
Physics for Scientists and Engineers, Technology Update (No access codes included)
- The frequency of the siren of an ambulance is 900 Hz and is approaching you. You are standing on a corner and observe a frequency of 960 Hz. What is the speed of the ambulance (in mph) if the speed of sound is v = 340.00 m/s?arrow_forwardHorseshoe bats use the Doppler effect to determine their location. A Horseshoe bat flies toward a wall at a speed of 15.0 m/s while emitting a sound of frequency 19.6 kHz. What is the beat frequency between the emission frequency and the echo? The speed of sound at T = 20°C is v = 343 m/s. (See Appendix B Table B.5.)arrow_forwardan ultrasonic scan uses the echo waves coming from something moving inside the body and the waves that are directly received from the transmitter to form a measurable beat frequency. this allows the speed of the internal structure to be isolated and analyzed. the speed of the ultrasound waves in tissue is about 1540 m/s. what is the beat frequency detected when wves with a frequency of 4.40 MHz are used to scan a fetal heartbeat (moving at a speed of 9.30 cm/s)f(beat) = |f1 - f2|arrow_forward
- An ultrasonic scan uses the echo waves coming from something moving (such as the beating heart of a fetus) inside the body and the waves that are directly received from the transmitter to form a measurable beat frequency. This allows the speed of the internal structure to be isolated and analyzed. The speed of the ultrasound waves in tissue is about 1540 m/s. What is the beat frequency ?beats detected when waves with a frequency of 3.80 MHz are used to scan a fetal heartbeat (moving at a speed of ±8.50 cm/s)? hint that came with it: In this problem there's a stationary source of ultrasound that reflects sound off of a moving object which then returns back to the ultrasound device to measure the frequency. There are 2 Doppler shifts that need to be considered. First the stationary source and the moving observer. Second, when the sound reflects off, the moving object now becomes the source and the ultrasound device becomes the observer. In this shift, the frequency measured by the…arrow_forwardYou are standing on a train station platform as a train goes by close to you. As the train approaches, you hear the whistle sound at a frequency of f1 = 93 Hz. As the train recedes, you hear the whistle sound at a frequency of f2 = 75 Hz. Take the speed of sound in air to be v = 340 m/s. (a) Find an equation for the speed of the sound source vs, in this case it is the speed of the train. Express your answer in terms of f1, f2, and v. (b) Find the numeric value, in meters per second, for the speed of the train. (c) Find an equation for the frequency of the train whistle fs ("s" is for "source") that you would hear if the train were not moving. Express your answer in terms of f1, f2, and v. (d) Find the numeric value, in hertz, for the frequency of the train whistle fs that you would hear if the train were not moving.arrow_forwardA bat emits a sound at a frequency of 39.0 kHz as it approaches a wall. The bat detects beats with a frequancy of 1070 Hz between the sound it emits and the echo bouncing from the wall. What is the speed of the bat (in m/s) if the speed of sound in air is 343 m/s?arrow_forward
- An fıre truck races down a road at 75 km/h with its siren blazing. The siren has a frequency of 580 Hz and the temperature of the air is 22°C. What is the frequency of the sound waves as they pass an observer? 3680 Hz O 617 Hz 325 Hz 547 Hzarrow_forwardLight is an electromagnetic wave and travels at a speed of 3.00 × 10^8 m/s. The human eye is most sensitive to yellow-green light, which has a wavelength of 5.84 × 10-7 m. What is the frequency of this light? Note: Answer in 3rd significant digit with unitarrow_forwardA bat can detect small objects, such as an insect, whose size is approximately equal to one wavelength of the sound the bat makes. If bats emit a chirp at a frequency of 64.0 kHz, and if the speed of sound in air is 340 m/s, what is the smallest insect a bat can detect?arrow_forward
- Suppose a bat emits ultrasound at frequency fbe = 81.28 kHz while flying with velocity vb = (12.16 m/s)i as it chases a moth that flies with velocity vm = (3 m/s)i. What frequency fmd does the moth detect? What frequency fbd does the bat detect in the returning echo from the moth? Assume the speed of sound is 343 m/s. Round all your answers off to two decimal places.arrow_forwardA spaceship is approaching a space station at a speed of 1.60 ✕ 105 m/s. The space station has a beacon that emits green light with a frequency of 5.94 ✕ 1014 Hz. (a) What is the frequency of the beacon observed on the spaceship? (Use c = 2.9979 ✕ 108 m/s for the speed of light. Enter your answer to at least five significant figures.)answer in Hzarrow_forwardA sound wave has a frequency of 632 Hz in air and a wavelength of 0.51 m. What is the temperature of the air? Assume the velocity of sound at 0°C is 331 m/s. Answer in units of °C.arrow_forward
- College PhysicsPhysicsISBN:9781305952300Author:Raymond A. Serway, Chris VuillePublisher:Cengage LearningUniversity Physics (14th Edition)PhysicsISBN:9780133969290Author:Hugh D. Young, Roger A. FreedmanPublisher:PEARSONIntroduction To Quantum MechanicsPhysicsISBN:9781107189638Author:Griffiths, David J., Schroeter, Darrell F.Publisher:Cambridge University Press
- Physics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningLecture- Tutorials for Introductory AstronomyPhysicsISBN:9780321820464Author:Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina BrissendenPublisher:Addison-WesleyCollege Physics: A Strategic Approach (4th Editio...PhysicsISBN:9780134609034Author:Randall D. Knight (Professor Emeritus), Brian Jones, Stuart FieldPublisher:PEARSON
![Text book image](https://www.bartleby.com/isbn_cover_images/9781305952300/9781305952300_smallCoverImage.gif)
![Text book image](https://www.bartleby.com/isbn_cover_images/9780133969290/9780133969290_smallCoverImage.gif)
![Text book image](https://www.bartleby.com/isbn_cover_images/9781107189638/9781107189638_smallCoverImage.jpg)
![Text book image](https://www.bartleby.com/isbn_cover_images/9781337553278/9781337553278_smallCoverImage.gif)
![Text book image](https://www.bartleby.com/isbn_cover_images/9780321820464/9780321820464_smallCoverImage.gif)
![Text book image](https://www.bartleby.com/isbn_cover_images/9780134609034/9780134609034_smallCoverImage.gif)