4. An emergency vehicle is traveling at 45 m/s approaching a car heading in the same direction at a speed of 24 m/s. The emergency vehicle driver has a siren sounding at 650 Hz. At what frequency does the driver of the car hear the siren? (Assume the speed of sound in air is 340 m/s.)

1. At an air show, a jet flies directly toward the stands at a speed of 1160 km/h, emitting a frequency of 3620 Hz, on a day when the speed of sound is 342 m/s. What frequency (in Hz) is received by the observers? (Answer in Hz)   2. What frequency (in Hz) do they receive as the plane flies directly away from them? (Answer in Hz)

An ambulance with a siren sounding at 1600 Hz drives by a bystander at the sidewalk. After being passed, the bystander hears a frequency of 1590 Hz. How fast is the ambulance moving? Assume speed of sound is 343 m/s.

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A train is leaving the platform at the speed of 33 m/s.A person standing on the platform waiting for his train observes frequency of 0.400 kHz.from the train's whistle that was pulling off the station.What is the actual frequency of the train whistle? (Take the speed of sound to be 340 m/s.) 364 Hz O 439 Hz 361 Hz O 444 Hz

While running on the sidewalk at 5.2m/s , you hear an ambulance approaching you from behind. It is traveling at 27.8m/s with respect to the road. If the ambulance has a siren with a frequency of 2.30x10°Hz and the speed of sound is 343m/s , at what frequency do you hear the siren?

4. A car, sounding its horn, is moving at v. =158.4km / h directly toward a stationary wall in still air. The speed of sound, in the air, is v=330.0 m/s. The horn produces sound at a frequency of f. =1000.Hz (ie. if the car were stationary, that is the frequency you would hear). a) What frequency is heard by an observer at rest at the wall (assume the car is moving straight toward the observer)? b.) What is the wavelength, in the still air, of the sound wave approaching the wall? c) What is the frequency of the reflected sound heard by an occupant of the car?

An osprey’s call is a distinct whistle at 2200 Hz. An osprey calls while diving at you, to drive you away from her nest. You hear the call at 2300 Hz. How fast is the osprey approaching?

You are moving at 20 m/s. A police car with a siren blasting is first behind you and overtaking you. You hear a frequency of 800 HZ. He passes you (lucky you!) and you now hear a frequency of 680 HZ. How fast is the police car moving?

30. A man drops a rock into a well and he hears the splash 3.00 seconds later. If the air temperature is 27°C, how far below the top of the well is the surface of the water? Assume that the speed of sound is constant, and you may ignore the effects of air resistance.