Question

Two trains emit 445 Hz whistles. One train is stationary. The conductor on the stationary train hears a 3.1 Hz beat frequency when the other train approaches. What is the speed of the moving train?

Answer #1

Two trains are traveling on the same track in the same
direction. The whistles of both trains produce a 440Hz frequency
sound. The lead train is traveling at 120km/hr. Both trains blow
their whistles. The driver of the lead train hears that the
following train has a higher frequency sound. She also notices an
oscillation of 4.0 Hz.
A.) How do you explain the higher frequency sound heard by the
lead train driver?
B.) How do you explain the 4.0Hz...

A girl is standing at a railroad crossing for a track that runs
east and west. As she faces the track, east is to her right and
west is to her left. Two trains on the track some distance apart
are headed west, both at speeds of 7.20 m/s, and blowing their
whistles (which have the same frequency). One train is approaching
her from the east and the other is traveling away from her toward
the west. (Assume the speed...

Two automobiles are equipped with the same single frequency
horn. When one is at rest and the other is moving toward the first
at 18 m/s, the driver at rest hears a beat frequency of 4.5 Hz.
What is the frequency (Hz) the horns emit? Assume T = 20 degrees
C

Two test pilots are in identical jets that produce a
characteristic tone of 587 Hz. One jet is stationary on the
airstrip and the second is approaching the airstrip at a speed of
72.6% the speed of sound. Take the speed of sound in air to be 343
m/s. The pilot of each jet listens to the sound produced by the
other jet. Determine the following. (a) Which pilot hears a greater
Doppler shift? the stationary pilot the moving pilot...

Two trains are traveling toward each other. One train is
traveling at 31 [m/sec] from our left to the right. The other train
is traveling at 40 [m/sec] from the right to the left. The train on
the left blows the whistle at fο = 520 [Hz]. a) What is the
frequency heard on the other train in still air? b) What is the
frequency heard on the other train if there is wind blowing from
the right to the...

Two automobiles are equipped with the same singlefrequency horn.
When one is at rest and the other is moving toward the first at 19
m/sm/s , the driver at rest hears a beat frequency of 4.0 HzHz .
What is the frequency the horns emit? Assume T=20∘C

A person is standing at a train station, and two identical
trains are passing each other 100 m down the tracks. Train A is
moving away from him at 20 m/s, and train B is moving toward him at
20 m/s. As the trains pass each other, they emit identical pulses
of sound from their horns. At the instant that the pulses are
sounded, the trains' horns are both precisely 100 m away from him.
What will the person hear?...

A
train is moving away from an observer at 31.0 m/s blows a 305 Hz
whistle. What frequency is detected by the stationary observer?
Assume standard pressure and 20°C for the speed of sound.

What is the Doppler effect? Discuss one practical application of
Doppler effect.
A bat at rest sends out ultrasonic sound waves at 60.0 KHz and
receives them returned
from an object moving directly away from it at 30.0 m/s. What is
the received sound
frequency?
Two automobiles are equipped with the same single frequency
horn. When one is at rest
and the other is moving toward the first at 20 m/s, the driver at
rest hears a beat frequency
of...

Two loudspeakers that emit sound of 686 Hz, but 900 out of
phases are placed along walls on the opposite sides of a gym and
are separated by a
distance of 25.00m. (I)If Janet starts walking from one speaker
towards the other speaker, how far does she have to walk before she
hears the first
constructive interferences? (II) What is the phase difference when
she is midway between the two speakers? The speed of sound in air
is
343.0m/s.

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