Question

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.

Answer #1

A truck moving at 36 m/s passes a police car moving at 45 m/s in
the opposite direction. The frequency of the sound emitted by the
siren on the police car is 500 Hz and the speed of sound in air is
343 m/s.
(a) What is the frequency heard by an observer in the truck as
the police car approaches the truck?
(b) What is the frequency heard by an observer in the truck
after the police car passes...

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 driver travels northbound on a highway at a speed of 24.0 m/s.
A police car, traveling southbound at a speed of 31.0 m/s,
approaches with its siren producing sound at a frequency of 2400
Hz.
(a) What frequency does the driver observe as the police car
approaches? Hz
(b) What frequency does the driver detect after the police car
passes him? Hz
(c) Repeat parts (a) and (b) for the case when the police car is
traveling northbound.
while...

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 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).

A stationary police car emits a sound of frequency 1225 Hz that
bounces off of a car on the highway and returns with a frequency of
1265 Hz. The police car is right next to the highway, so the moving
car is traveling directly toward or away from it.
What frequency would the police car have received if it had been
traveling toward the other car at 22.0 m/s?
P/s: the car was moving 5.53 m/s

stationary police car emits a sound of frequency 1200 Hz that
bounces off of a car on the highway and returns with a frequency of
1280 Hz . The police car is right next to the highway, so the
moving car is traveling directly toward or away from it.
Part A: How fast was the moving car going?
Part B: Was the moving car moving towards or away from the
police car?
Part C: What frequency would the police car...

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...

A police car is chasing a car at 40m/s. If the siren transmit at
a frequency of 20000 Hz and you hear 20010 from your car. What is
your velocity?

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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