Question

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.)

Answer #1

A sound wave has an intensity level of 123.5 dB in air. The
density of air at 20.0°C is ρ = 1.20 kg/m3 (see Table
9.1). The speed of sound in air at 20.0°C is v = 343 m/s.
What maximum force does this wave exert on an eardrum of area
0.590 × 10−4 m2? in in mN

13. The pressure amplitude of a 500.0 Hz sound wave is 2.0 x
10-2 Pa. The bulk modulus of air is 1.42 x 105 Pa and the density
of the air is 1.2 kg/m3.
Find: (a) The speed of sound in air. (344.0 m/s)
(b) The displacement amplitude.
(c) The intensity of the wave.
(d) The intensity level of sound.

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.)

A sound wave traveling in 20ºC air has a pressure amplitude of
0.5 Pa. What is the intensity of the wave?

A rather typical sound wave has a pressure amplitude of 2×10-2
Pa and a frequency of 103Hz. Assuming that the wave is a plane wave
propagating to the right in air at 22°C and 1.01×105 Pa:a) Write
the function describing this wave. Give numerical values for the
circular frequency ω, the wave number k, and the amplitude. b) What
is the amplitude of the particle velocity in this wave?c) What is
the maximum percentage change in the air density due...

A sinusoidal sound wave moves through a medium and is described
by the displacement wave function
s(x,t) = (2.00µm)cos[(15.7 rad m )x − (858 rad s )t].
a) Find the amplitude of this wave.
b) Find the wavelength of this wave.
c) Find the speed of this wave.
d) Determine the instantaneous displacement from equilibrium of
the elements of the medium at the position x = 0.0500 m and t =
3.00 ms.
e) Determine the maximum speed of the...

Determine the amplitude of the displacement for sound with an
intensity of 120 dB, which corresponds to the threshold of pain for
the human ear. The sound has a frequency of 1 kHz. The bulk modulus
of air is 1.42x10 5 Pa and the speed of sound in air is 340 m/s

The pressure variation in a sound wave is given by
ΔP = 0.0010 sin( 0.66 πx− 1520
πt),
where ΔP is in pascals, x in meters, and
t in seconds.
Part A
Determine the wavelength, assume the density of the medium to be
ρ=2.3⋅103kg/m3.
Express your answer using two significant figures.
Part B
Determine the frequency
Part C
Determine the speed.
Express your answer using two significant figures.
Part D
Determine the displacement amplitude of the wave.
Express your answer...

1.) At the race track, one race car starts its engine with a
resulting intensity level of 107.9 dB at point P. Then 7
more cars start their engines. If the other 7 cars each produce the
same intensity level at point P as the first car, what is
the new intensity level with all 8 cars running? ____dB
2.) A 96.0-Hz sound wave is barely audible at a sound intensity
level of 60.0 dB. The density of air at...

(a) If two sound waves, one in a gas medium and one in a liquid
medium, are equal in intensity, what is the ratio of the pressure
amplitude of the wave in the liquid to that of the wave in the gas?
Assume that the density of the gas is 2.05 kg/m3 and the density of
the liquid is 1030 kg/m3. The speed of sound is 341 m/s in the gas
medium and 1490 m/s in the liquid. (b) If...

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