Question

At what frequency would the wavelength of sound in air be equal
to the mean free path of oxygen molecules at 1.2 atm pressure and
-1.6°C? Take the diameter of an oxygen molecule to be 3.1 ×
10^{-8} cm and the speed of sound to be 340 m/s.

Answer #1

plz rate

What is the intensity of a sound that would result in a sound
intensity level of 45.5 dB? Give the answer in scientific
E-notation.
A fixed warning siren produces a pitch (frequency) of 888 Hz. An
observer drives directly away from the blaring warning siren at
55.0 mph. Use 343 m/s for the speed of sound in air. What frequency
is heard by the observer?
If the speed of sound in air is found to be 352 m/s...

A. What length should an oboe have to produce a fundamental
frequency of 244 Hz on a day when the speed of sound is 343 m/s? It
is open at both ends.
B. What frequency is received by a person watching an oncoming
ambulance moving at 119 km/h and emitting a steady 706 Hz sound
from its siren? The speed of sound on this day is 333 m/s.
C. What energy in millijoules falls on a 0.808 cm diameter
eardrum...

PART C: A cubical box 1.00 mm on a side
contains air at 20.0∘C∘C. What would the pressure inside the box
have to be in order for the mean free path of air molecules
(assumed to be spheres of radius 2.0×10−10m2.0×10−10m) to be 1.00
mm, so that a typical molecule suffers no collisions with other
molecules as it travels the width of the box?
PART D:
How many moles of air would be inside the box at the pressure
calculated...

Diagnostic ultrasound of frequency 4.92 MHz is used to examine
tumors in soft tissue. (a) What is the wavelength in air of such a
sound wave? (b) If the speed of sound in tissue is 1370 m/s, what
is the wavelength of this wave in tissue? (Take the speed of sound
in air to be 343 m/s.)

A sound wave caused by a piano has a frequency of 678 Hz, and
the speed in air is 330 m/s.
(a) What is the wavelength of this wave?
(b) At any given point in space, how long does it take for the
air to go from maximally compressed to maximally expanded?
(c) For two points 72.5 cm apart, what is the phase difference
of the wave between these points?

An experimenter wishes to generate in air a sound wave that has
a displacement amplitude of 4.50 10-6 m. The pressure amplitude is
to be limited to 0.810 Pa. What is the minimum wavelength the sound
wave can have? (Take the equilibrium density of air to be ρ = 1.20
kg/m3 and assume the speed of sound in air is v = 343 m/s.)

At some altitude above the Earth’s surface, the density of air
molecules is3.3×10^13 molecules/cm^3. At this altitude, the
temperature is −44°C.
What is the mean free path of air molecules at this altitude?
Assume a molecular diameter of 2.1×10^-8??.
What is the pressure at this altitude?

7. A nitrogen molecule has a diameter of about 0.29 nm. The mean
free path of a nitrogen molecule in a tank of dry nitrogen at room
temperature (293 K) and standard pressure (1 atm) is about 0.10 µm.
A tank containing nitrogen at standard temperature (273 K) and
pressure has volume V. If the tank is compressed by means of a
piston to 20% of its original volume, what is the mean free path
for a nitrogen molecule under...

A sound wave of frequency 349 Hz has an intensity of 4.03
?W/m2. What is the amplitude of the air
oscillations caused by this wave? (Take the speed of sound to be
343 m/s, and the density of air to be 1.21 kg/m3.)

1.)what is the frequency of the microwave whose wavelength is
1.60 cm?
2.) Alpha particles of charge q=+2e and mass m=6.6x10^-27 are
emitted from a radioactive source at a speed of 1.6x10^10 m/s. What
magnetic field strength would be required to bend them into a
circular path of radius r=0.25?

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