physics

The siren on an ambulance is emitting a sound whose frequency is 2421 Hz. The speed of sound is 343 m/s. (a) If the ambulance is stationary and you (the "observer") are sitting in a parked car, what are the wavelength and the frequency of the sound you hear? (b) Suppose that the ambulance is moving toward you at a speed of 28.5 m/s. Determine the wavelength and the frequency of the sound you hear. (c) If the ambulance is moving toward you at a speed of 28.5 m/s and you are moving toward it at a speed of 12.6 m/s, find the wavelength and frequency of the sound you hear.

  1. 👍 0
  2. 👎 0
  3. 👁 592
  1. The formula you will need to answer all of these problems can be found at
    http://en.wikipedia.org/wiki/Doppler_effect

    1. 👍 0
    2. 👎 0
  2. 456

    1. 👍 0
    2. 👎 0
  3. A. wavelength= 343/ frequency of siren
    frequency= 343/ wavelength

    B. Frequency= 343* frequency of siren/ (343-velocity of ambulance)

    wavelength= 343/ frequency you found above

    C. Frequency= (343+velocity of your car)*frequency of siren / (343- velocity of ambulance)

    wavelength= 343/ frequency you found above

    1. 👍 0
    2. 👎 0

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics

    A harpsichord string of length 1.50 m and linear mass density 26.0 mg/m vibrates at a (fundamental) frequency of 460.0 Hz. (a) What is the speed of the transverse string waves? m/s (b) What is the tension? N (c) What are the

  2. Physics--please help!!

    A student in a parked car honks the horn, which has a `proper' frequency of 320 Hz. An observer in an approaching vehicle measures the frequency of the sound to be 355 Hz. Calculate the speed of the approaching vehicle. Use 340

  3. PHY1015S

    A policeman in a stationary car measures the speed of approaching cars by means of an ultrasonic device that emits a sound with a frequency of 41.2 kHz. A car is approaching him at a speed of 33.0 m/s. The wave is reflected by the

  4. SCIENCE

    The diagram shows the variation of air pressure from an alarm siren at particular instant. The speed of sound in the air is 340m/s. what is the period of alarm siren.

  1. Physics Sound Waves

    A fire truck emitting a 450 Hz signal passes by a stationary detector. The difference in frequency measured by the detector is 58 Hz. If the speed of sound is 345 m/s, how fast is the fire truck moving? The answer should be 22 m/s

  2. Physics

    A source passing a stationary observer is emitting a frequency of 560 Hz. If the speed of sound is 345 m/s, what must speed of the source be if the frequency speed is 480 hz? Here's what I've tried... Fo=480 Hz FObs = 480 + 560

  3. Physics

    Two cars have identical horns, each emitting a frequency of f= 395 hz. One of the cars is moving with a speed of 12 m/s toward a bystander waiting at a corner, and the other car is parked. The speed of sound is 343 m/s. what is

  4. Physics

    a)What frequency is received by a person watching an oncoming ambulance moving at 120 km/h and emitting a steady 700 Hz sound from its siren? The speed of sound on this day is 345 m/s. b)What frequency does she receive after the

  1. physics-sound

    A police car moving at 41 m/s is initially behind a truck moving in the same direction at 17 m/s. The natural frequency of the car's siren is 800 Hz. The change in frequency observed by the truck driver as the car overtakes him is

  2. Physics - Doppler Effect

    The siren in an ambulance has a frequency (according to you) of 1100 hz as it moves towards you at a speed v. It then makes a u-turn and travels away from you with a speed v, and you hear a frequency of 950 hz. What is the final

  3. physics

    A sound wave travels in air at a frequency of 500 Hz. If part of the wave travels from air into water, does its frequency change? Does its wavelength change? Note that the speed of sound in air is about 340 m/s, whereas the speed

  4. Science

    (7 points) If the pitch of a sound is decreasing, is the object emitting the sound moving toward or away from the observer? Explain your answer in terms of frequency. (7 points) If the pitch of a sound is increasing, is the object

You can view more similar questions or ask a new question.