Question

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. 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 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...

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

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.)

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 has a siren of frequency 880 Hz. You are sitting at
a stop light as the ambulance passes you, traveling at a constant
22 m/s. If the speed of sound is 343 m/s, what is the change in the
frequency that you hear as the ambulance passes you?
A.) -56 Hz B.) -53 Hz
C.) -60 Hz D.) -116
Hz E.) -113 Hz

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)

A police car sounding a siren with a frequency of 1560 Hz is
traveling at 110 km/h . A.What frequencies does an observer
standing next to the road hear as the car approaches and as it
recedes? Express your answers using three significant figures
separated by a comma. B.What frequencies are heard in a car
traveling at 90.0 km/h in the opposite direction before and after
passing the police car? Express your answers using three
significant figures separated by a...

The frequency will sound different if we hear a sound source
moving relative to us. This phenomenon is called the Doppler Effect
in Physics. An ambulance sounds a siren at 1515 Hz and passes a
cyclist moving at 2.12 m / s. After the ambulance passed, the
cyclist heard a siren sound at a frequency of 1501 Hz. The speed of
sound in the air is about 343 m / s.
What is the speed (speed) of the ambulance in...

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