1. (a) What frequency is received by a person watching an oncoming ambulance moving at 120 m emitting a steady 806 Hz sound from its siren? The speed of sound on this day is 347 S fobs1 = Hz (b) What frequency does she receive after the ambulance has passed? Hz fobs2 = km h and
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- (a) What frequency is received by a person watching an oncoming ambulance moving at 120 km/h and emitting a steady 853 Hz sound from its siren? The speed of sound on this day is 345 m/s. Hz (b) What frequency does she receive after the ambulance has passed? HzBats of the Vespertilionidae family detect the distance to an object by timing how long it takes for an emitted signal to reflect off the object and return. Typically they emit sound pulses 3.00 ms long and 70.0 ms apart while cruising. If an echo is heard 32.8 ms later (vsound = 331 m/s), how far away is the object? When an object is only 39.2 cm away, how long will it be before the echo is heard? When an object is only 39.2 cm away, the bat __________ able to detect the echo.(a) What frequency is received by a person watching an oncoming ambulance moving at 115 km/h and emitting a steady 833 Hz sound from its siren? The speed of sound on this day is 345 m/s.(b) What frequency does she receive after the ambulance has passed?
- (a) What frequency is received by a person watching an oncoming ambulance moving at 105 km/h and emitting a steady 713 Hz sound from its siren? The speed of sound on this day is 345 m/s. (b) What frequency does she receive after the ambulance has passed?An ambulance with a siren emitting a frequency of 1600HZ overtakes and passes a cyclist pedaling a bike at 4 m/s. After being passed, the cyclist hears a frequency of 1590HZ. How fast is the ambulance moving? Temperature of air is 25°C. 2.A fire truck sits at rest and emits a sound from its siren with a frequency of 385.0 Hz. If you are biking away from the fire truck at a velocity of 5.200 m/s, what frequency will you hear from the siren? Assume the speed of the sound being emitted from the siren is 327.0 m/s.
- Answer Please22.27. A car blowing a 560-Hz horn moves at a speed of 15 m/s as it first approaches a stationary listener and then moves away from a stationary listener at the same speed. What are the frequencies heard by the listener? Ans. 586 Hz, 537 HzA baseball hits a car, breaking its window and triggering its alarm which sounds at a frequency of 1270 Hz. What frequency (in Hz) is heard by a boy on a bicycle riding away from the car at 7.95 m/s? Take the speed of sound to be 343 m/s
- A bat at rest sends out ultrasonic sound waves at 54.0 kHz and receives them returned from an object moving directly away from it at 33.0 m/s . What is the received sound frequency?A Doppler flow meter uses ultrasound waves to measure blood-flow speeds. Suppose the device emits sound at 3.5 MHz, and the speed of sound in human tissue is about 1540 m/sWhat is the expected beat frequency if blood is flowing in large leg arteries at 3.0 m/s directly away from the sound source?3. A bystander hears a siren vary in frequency from 598 Hz to 364 Hz as a fire truck approaches, passes by, and moves away on a straight street. What is the speed of the truck? (Take the speed of sound in air to be 343 m/s.) m/s f60 ss f60 s ssfo ssf60 s