Question

From a vantage point very close to the track at a stock car race, you hear the sound emitted by a moving car. You detect a frequency that is 0.841 times smaller than that emitted by the car when it is stationary. The speed of sound is 343 m/s. What is the speed of the car?

The linear density of the A string on a violin is 2.36 × 10-4 kg/m. A wave on the string has a frequency of 552 Hz and a wavelength of 48.8 cm. What is the tension in the string?

Answer #1

where, c is the speedof sound.

So, putting the given values, we get

2)

The velocity of sound in the string

And the velocity of wave in the string is given by ( T is the
tension in the string )

So,

2. From a vantage point very close to the track at a stock car
race, you hear the sound emitted by a moving car. You detect a
frequency that is 0.852 times smaller than that emitted by the car
when it is stationary. The speed of sound is 343 m/s. What is the
speed of the car?
3.Hearing damage may occur when a person is exposed to a sound
intensity level of 90.0 dB (relative to the threshold of human...

A car approaches you at a constant speed, sounding its horn, and
you hear a frequency of 40 Hz. After the car goes by, you hear a
frequency of 60 Hz. What is the frequency of the sound emitted by
the horn? The speed of sound in the air is 343 ms-1.

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

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
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...

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 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...

1.The human ear canal is about 2.3 cm long. If it is regarded as
a tube open at one end and closed at the eardrum, what is the
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?kHz
2. An airplane traveling at half the speed of sound emits a
sound of frequency 5.30 kHz.
(a) At what frequency does a stationary listener hear the sound
as the plane approaches?
? kHz
(b) At what frequency does...

A stone is dropped from the top of a cliff. The splash it makes
when striking the water below is heard 3.2 s later. How high is the
cliff?
2. The pressure variation is a sound wave is given by Δ P =
0.0035 sin (0.38 π x – 1350 π t) Determine a. the wavelength b. the
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wave. Assume the density of the medium to be 2.2 x...

You can sometimes hear a low-frequency “moaning” noise when
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