Question

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 moving toward you at a speed of 26.8 m/s and you are moving toward it at a speed of 13.0 m/s, find the wavelength and frequency of the sound you hear.

a) |
λ = |
sHzm/sm | |

f_{o} = |
mm/sHzs | ||

(b) |
λ' = |
sm/sHzm | |

f_{o} = |
m/sHzms | ||

(c) |
λ' = |
sHzm/sm | |

f_{o} = |

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...

The siren on an ambulance is emitting a sound whose frequency is
2650 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 26.3 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 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).

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.)

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 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...

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?

An object is moving at a velocity of 225 m/s, emitting a sound
at 343 Hz. The observer is stationary. What is the observed
frequency as the source approaches the observer? What is the
observed frequency after the source passes the observer?

(a)
What frequency (in Hz) is received by a person watching an
oncoming ambulance moving at 106 km/h and emitting a steady 850 Hz
sound from its siren? The speed of sound on this day is 345
m/s.
Hz
(b)
What frequency (in Hz) does she receive after the ambulance has
passed?
Hz

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