Question

A siren emitting a sound of frequency 1000 Hz moves towards you, and away from a cliff at a speed of 25 m/s. a) what is the frequency of sound you heard coming directly to you from the siren? B) what is the frequency of sound you hear reflected from the cliff? (speed of sound = 340 m/s).

Answer #1

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...

A sound source with a frequency of 1800 Hz moves away 24 m / s
from a reflective wall which also moves away from the source at 26
m / s. If the speed of sound is 343 m / s determine the frequency
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A race car is traveling towards you and you hear a sound of
frequency 4072 Hz while the car is traveling towards you. Then the
car shoots by you and as the car is traveling away from you, you
hear a frequency of 2774 Hz. The car is moving at a constant speed
during the whole time you hear these two frequencies, what is the
speed (in m/s) of the car

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 bystander hears a siren vary in frequency from 554 Hz to 390
Hz as a fire truck approaches, passes by, and moves away on a
straight street. What is the speed of the truck? (Take the speed of
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A bystander hears a siren vary in frequency from 600 Hz to 394
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straight street. What is the speed of the truck? (Take the speed of
sound in air to be 343 m/s.)

A bystander hears a siren vary in frequency from 582 Hz to 394
Hz as a fire truck approaches, passes by, and moves away on a
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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....

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 police car with a siren of 300 Hz. is moving toward a
warehouse at 30 m/s. What frequency does the driver hear reflected
from the warehouse? The speed of sound is 343 m/s.

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