The figure below shows wave fronts of sound waves from the siren of a police car. Two people on both side of the car are running at 5 m/s to the left. The frequency of the siren is 400 Hz. The person on the left observes a frequency of 388.7 Hz. Speed of sound in air is 340 m/s. a) How fast is the policy car travelling? b) What is the frequency observed by the person on the right? c) What is the wavelength observed by the person on the righ?
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- There was an accident and NASA engineers are trying to sort out where two of their Mars Rovers, Tango and Foxtrot, have landed. The engineers know that landing site A is much hotter than landing site B. Unfortunately, the only working sensors on Tango and Foxtrot measure the speed of sound. If Tango measures the speed of sound at it's landing site as 240 m/s, while Foxtrot measures speed of sound as 258 m/s at it's landing site, where has each rover landed?A sound source with a frequency of 725 Hz moves away from a stationary observer at a rate of 15m/s. What frequency does the observer hear?An ambulance moving in still air at a constant speed of v, =135.0 km / h, on a straight 5. road, has a horn that emits sound at a frequency f =1450 Hz. Assume that the speed of sound in the still air is v=350 m/s. a) What is the frequency fi of the sound heard by an observer standing still on the road as the ambulance approaches? b.) What is the wavelength, 4, of the sound in the still air directly in front of the ambulance as it is approaching? c.) What is the frequency f, of the sound heard by a moving observer moving directly toward the approaching ambulance at a speed v, = 95.0km / h? d.) Suppose that the sound from the ambulance is reflected off of a reflector moving directly toward the approaching ambulance at a speed v, -95.0km / h. Assuming that the sound can be heard, what is the frequency f, of the reflected sound wave heard by the ambulance driver?
- While standing next to the main entrance of the E-building a LaGuardia student notices an ambulance car approaching her at a speed of 24.9 m/s. What are the frequency and wavelength of the sound wave that the student hears while the car is approaching? Take that the car has a siren producing a 1.2-kHz signals when it is stationary and 339 m/s for the speed of sound. The frequency of the sound wave, f₁ = The wavelength of the sound wave, A₁ = Units kHz The wavelength of the sound wave, ₂ = Units Select an answer ✓ When the car has passed the building and is moving away from the student, what are frequency and wavelength of the sound wave she would hear in this case? The frequency of the sound wave, f₂ = Units Select an answer ✓ Units Select an answer ✓S X * # 3 4. A bystander hears a siren vary in frequency from 594 Hz to 388 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.) X 62.7 m/s E D C 25 $ 4 888 R % 5 V tv A B 16 de MacBook Air & 7 H VO 8 UTO N A J 9 M K MOSISO O zoom 1 ge + 11 tTwo submarines travel horizontally and in the same direction through ocean water. Submarine A travels at 11 m/s relative to the water. It is chasing submarine B which travels at 3 m/s relative to the water. Submarine A emits a sonar signal of frequency 5270 Hz. The sonar signal reflects from submarine B and echoes back to submarine A. Find the frequency of the echo sound that is heard on submarine A. The speed of sound in the water is 1533 m/s.
- how do you do question 5? this is a non graded practice worksheetTwo eagles fly directly toward one another, the first at 15.0 m/s and the second at 26.0 m/s. Both screech, the first one emitting a frequency of 3300 Hz and the second one emitting a frequency of 3800 Hz. What frequencies (in Hz) do they receive if the speed of sound is 330 m/s? first eagle Hz second eagle HzWhile sitting next to a road on a calm, warm 27.9ºC evening, you see an ambulance's lights flashing in the distance coming towards you. You hear a frequency of 140 Hz. However, you know that ambulances have sirens that emit sound at 130 Hz. How fast is the ambulance approaching you, in m/s?
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