A listener at rest (with respect to the air and the ground) hears a signal of frequency fi from a source moving toward him with avelocity of 13 m/s, due east. If the listener then moves toward the approaching source with a velocity of 23 m/s, due west, he hears afrequency f2 that differs from f1 by 42 Hz. What is the frequency of the source? (Take the speed of sound in air to be 340 m/s.)NumberiUnits

Using Doppler effect, write the expression of the observed frequency when listener is at rest.

Answered: A listener at rest (with respect to the…

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter17: Sound

Section: Chapter Questions

Problem 117P: Two eagles fly directly toward one another, the first at 15.0 m/s and the second at 20.0 m/s. Both...

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(a) At an air show a jet flies directly toward the stands at a speed of 1200 km/h, emitting a frequency of 3500 Hz, on a day when the speed of sound is 342 m/s. What frequency is received by the observers? (b) What frequency do they receive as the plane flies directly away from them?
Two eagles fly directly toward one another, the first at 15.0 m/s and the second at 20.0 m/s. Both screech, the first one emitting a frequency of 3200 Hz and the second one emitting a frequency of 3800 Hz. What frequencies do they receive if the speed of sound is 330 m/s?
What frequency is received by a mouse just before being dispatched by a hawk flying at it at 25.0 m/s and emitting a screech of frequency 3500 Hz? Take the speed of sound to be 331 m/s.
What frequency (in Hz) is received by a person watching an oncoming ambulance moving at 106 km/h and emitting a steady 950 Hz sound from its siren? The speed of sound on this day is 345 m/s. (b) What frequency (in Hz) does she receive after the ambulance has passed?
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.)
You 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?
A listener at rest (with respect to the air and the ground) hears a signal of frequency f1 from a source moving toward him with a velocity of 15 m/s, due east. If the listener then moves toward the approaching source with a velocity of 25 m/s, due west, he hears a frequency f2 that differs from f1 by 37 Hz.What is the frequency of the source? (Take the speed of sound in air to be 340 m/s.)
An 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.
A plane is flying at Mach 1.2, and an observer on the ground hears the sonic boom 15.00 seconds after the plane is directly overhead. What is the altitude of the plane? Assume the speed of sound is vw = 343.00 m/s.
A source produces a sound wave with a frequency of 800 Hz in air such that the velocity of the sound is 343 m/s. Thesource is moving away from a stationary observer at a rate of 15 m/s. Are the following ratios greater than one, equal toone, or less than one? velocity of the sound measured by the observer/ (343 m/s) frequency of the sound measured by the observer/ (800Hz) wavelength of the sound as measured by the observer/ (0.429 m)
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.
You are crossing in a crosswalk when an approaching driver blows his horn. If the true frequency of the horn is 264 Hz and the car is approaching you at a speed of 60.0 km/h, what is the apparent (or Doppler) frequency of the horn? Assume that the speed of sound in air is 340 m/s.

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