Question

The fire engine siren emits a 750 Hz sound as travels at 85 km/hr. Calculate the frequencies heard by a stationary observer as the fire engine approaches and then travels away from the observer.

Answer #1

Explain in your own words how an adjustable capacitor allows a
radio receiver to tune in a specific radio station.
The fire engine siren emits a 750 Hz sound as travels at 85
km/hr. Calculate the frequencies heard by a stationary observer as
the fire engine approaches and then travels away from the
observer.

A fire truck emits an 1080 Hz siren. As the truck approaches an
observer on the sidewalk, he perceives the frequency of the siren
to be 1150 Hz. Approximately what frequency does he hear after the
truck passes and is moving away? Assume the truck's velocity
remains constant, and that the velocity of sound in air is 340
m/s.

The siren of a fire engine has a frequency of 500 Hz. (a) The
fire engine approaches a stationary car at 20 m/s. What frequency
does a person in the car hear? (b) The fire engine stops and the
car drives away from it at 20 m/s. What frequency does the person
in the car hear?

The siren of a fire engine that is driving northward at 32.0 m/s
emits a sound of frequency 2200 Hz . A truck in front of this fire
engine is moving northward at 17.0 m/s .
Part A What is the frequency of the siren's sound that the fire
engine's driver hears reflected from the back of the truck?
Part B What wavelength would this driver measure for these
reflected sound waves?

(a) A fire truck with the 500 Hz siren on approaches an observer
at 50 m/s, who is at rest. What frequency would observer detect?
(b) A fire truck with the 500 Hz siren on is at rest. An observer
approaches the fire truck with the speed of 50 m/s. What frequency
would the observer detect? (The speed of sound is 343 m/s.)

PLEASE SHOW ALL STEPS
A fire truck moving at a speed of 40.0 m/s sounds its siren, which
has a frequency of 1250 Hz. It is
passing by a stationary observer in a quiet neighborhood on a
day when the temperature is 24.0° C.
A) What is the speed of sound in air on this day?
B) Calculate the frequency of the siren as heard by the
stationary observer when the fire truck is approaching the
observer.
C)
Calculatethefrequencyofthesirenasheardbythestationaryobserverwhenthefiretruckis
moving...

A fire engine's siren is 1400 Hz when at rest. Assume that the
speed of sound is 343 m/s in air.
What frequency do you detect if you move with a speed of 21 m/s
toward the fire engine? (Express your answer to two significant
figures.)
What frequency do you detect if you move with a speed of 21 m/s
away from the fire engine? (Express your answer to two
significant figures.)

(1) Suppose an oncoming ambulance moving at 115 km/h emits a
steady 810-Hz sound from its siren.
Part (a) What frequency, in Hz, is received by
a person watching the oncoming ambulance? The speed of sound on
this day is 345 m/s.
Part (b) What frequency, in Hz, does she
observe after the ambulance has passed?
(2). In this problem take the speed of sound to be 349 m/s.
How fast, in meters per second, does an observer need to...

A police car sounding a siren with a frequency of 1600 Hz is
traveling at 115 km/h . What frequencies does an observer standing
next to the road hear as the car approaches and as it recedes? What
frequencies are heard in a car traveling at 90.0 km/h in the
opposite direction before and after passing the police car? The
police car passes a car traveling in the same direction at 80.0
km/h. What two frequencies are heard in this...

A siren of a police car at rest emits at a predominant frequency
of 1310 Hz. A frequency of 1390_Hz is heard when the police car is
approaching an observer standing by a bus stop. a) What is the
velocity of the police car in m/s? b) what will be the frequency
heard by the person standing at the bus stop when the police car is
moving away? and c) Report the velocity of the police car in miles
per...

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