1. A car is blowing its horn (f = 285Hz) while driving away from you at 18.0m/s. The air temperature is -12.0°C. a) What frequency do you hear? b) How fast would the car have to drive, and in what direction, for you to hear a frequency of 356Hz?
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- 7. On a given day, the speed of sound in air is 3434m/s. As an emergency vehicle approaches you, youhear a tone that is 1200Hz. That type of emergency vehicle has a siren that emits a tone that is 1050Hz.(a) What is the speed of the vehicle? (b) As it drives away from you, what tone do you hear?5. A quantum object travels directly toward you at a constant rate while producing a sound with a singular frequency of 440 Hz. While you stand still, the object passes through you and continues Moving (you are uninjured). You measure an overall shift in the frequency you hear to be 25.0 Hz. Assume is it 20.0 °C during this shift. a) What is the speed of this particle? b) After is passes through you, you notice that your wallet is missing and see it attached to this particle. You begin accelerating toward the particle at a constant rate of 1.50 m/s² via ion propelled roller shoes. At what time do you perceive a frequency of 435 Hz? c) You stop accelerating when you perceive a frequency of 435 Hz and continue to travel at a constant rate at which time the particle then instantaneously reverses it path to return your wallet, traveling back toward you at its same constant rate which it initially had. What frequency do you then perceive at it travels toward you?8. A "G" on a guitar has a frequency of about 196Hz. To raise the note to a "B" at 247 Hz, what length would the string have to be shortened to? Assume the original string is 1.0m long.
- A train approaches a station and sounds it's horn which has a natural frequency of 150 Hz. The train is traveling at 35.0 m/s and the speed in air is 340 m/s. A) What frequency does a person standing at the station hear? B) What frequency does a person sitting on the train hear?A train passes by an little boy at the depot As it moves away from the boy at 65 m/s, the whistle emits a frequency of 4500hz. What frequency docs the little boy hear as the train barrcs off into the distance. Spced of sound in air is 343m/'s 1.5357.14 2. 5552.2 hz 3.4500hz 4.3783 hz 5.3647,26 hzThe highest frequency sound humans can hear is about 20,000 HzHz. 1. What is the wavelength of sound in air at this frequency? 2. What is the wavelength of the lowest sounds we can hear, about 20 HzHz?
- A train at rest blows a whistle to alert passengers that it is about to depart from a subway station. The pitch of this whistle is 1.14 × 104 Hz. The speed of sound in the air in that subway tunnel is 342 m/s. The speed of sound in iron is 5130 m/s. a. What is the wavelength of that sound in the air? b. Assuming that the sound was loud enough to be heard from the end of the 1200 m long tunnel, when was it heard through air? through the rails?A) a guitar player sounds C above middle C (522 Hz) while traveling in a convertible at 35m/s. If the car is coming toward you, what frequency would you hear? Use 343 m/s as the speed of sound. B) repeat the problem above, but with the car moving away from you. What frequency would you hear?What are the parts of this traveling wave? y(x,t) = (9.00 m) sin( (6ñ m¯¹)x + (4ñ rad/s)t - n/8) 1. Is this wave transverse or longitudinal? 2. Which direction is the wave moving?
- Thank you! The fundamental frequency of an organ pipe, closed at one end, is 258.3 Hz. a) What should the length of this organ pipe be? Speed of sound in air at T= 20.0°C is 343 m/s b) What is the fundamental frequency of this organ pipe if the temperature drops to 5.20°C?A.) I have an open-closed tube with a length of 0.7 m and a radius of 0.5 cm. What is the wavelength of mode number 2, in m? B.) I have an open-open tube with a length of 0.7 m and a radius of 1.6 cm. What is the frequency of mode number 1, in Hz? The speed of sound is 343 m/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?