Question

A pedestrian standing on the sidewalk heard a frequency of 835 HzHz when an ambulance is travelling away from him with a speed of 30.0 m/sm/s .

Speed of the sound in air = 343 m/s

a)What is the frequency of the ambulance's siren?

b)Then the ambulance stopped for a few seconds while sounding the siren. A driver in a car that is coming towards the ambulance heard a frequency of 950 HzHz . What is the speed of the car?

Express your answer using three significant figures.

Answer #1

A pedestrian standing on the sidewalk heard a frequency of 850
Hz when an ambulance is travelling away from him with a speed of
45.0 m/s m / s . Speed of the sound in air = 343 m/s Part A What is
the frequency of the ambulance's siren? Express your answer using
three significant figures. Part B Then the ambulance stopped for a
few seconds while sounding the siren. A driver in a car that is
coming towards the...

A pedestrian standing on the sidewalk heard a frequency of 845
Hz when an ambulance is traveling away from him with a speed of
45.0 m/s. Speed of sound in air = 343 m/s
A) what is the frequency of the ambulance siren? Express your
answer using three significant figures.
B) Then the ambulance stopped for a few seconds while sounding
the siren. A driver in a car that is coming towards the ambulance
heard a frequency of 995 Hz....

The siren of an ambulance has a frequency f=500 Hz. A pedestrian
standing on a sidewalk listens to this siren as the ambulance
passes by at a speed of 65 mph. The speed of sound in air is 330
m/s.
a) Calculate the total shift in frequency detected by the
pedestrian as the ambulance passes.

You are standing on the sidewalk and hear an ambulance siren at
500 Hz when the ambulance is approaching and at 400 Hz when the
ambulance is going away from you. How fast is the ambulance moving?
(Note: the speed of sound is 343 m/s).
a.) 38.1 m/s
b.)343 m/s
c.)58.6 m/s
d.)49.3 m/s
e.)12.2 m/s

The siren on an ambulance is emitting a sound whose frequency is
2450 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
26.8 m/s. Determine the wavelength and the frequency of the sound
you hear. (c) If the ambulance is...

Standing at a crosswalk, you hear a frequency of 590 Hz from the
siren of an approaching ambulance. After the ambulance passes, the
observed frequency of the siren is 497 Hz. Determine the
ambulance's speed from these observations. (Take the speed of sound
to be 343 m/s.)

A car moves at 20 m/s north. An ambulance passes it going 25 m/s
north, with its siren on, f = 500 Hz. Find the frequency heard in
the car when the ambulance is moving away. (The speed of sound in
air is 343 m/s)

The siren on an ambulance is emitting a sound whose frequency is
2550 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
26.2 m/s. Determine the wavelength and the frequency of the sound
you hear. (c) If the ambulance is...

An ambulance with a 200-Hz siren is moving at 30.0 m/s. Take the
speed of sound to be 340 m/s. a) What frequencies are observed by a
stationary person standing on the sidewalk as the ambulance
approaches and after it passes? b) Is this Doppler shift real or
just a sensory illusion?

Suppose you are stopped for a traffic light, and an ambulance
approaches you from behind with a speed of 18.5 m/s. The siren on
the ambulance produces sound with a frequency of 959 Hz as measured
when you are at rest relative to the ambulance. The speed of sound
in air is 343 m/s. What is the wavelength of the sound reaching
your ears?

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