Question

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.

Answer #1

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.)

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.)

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

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...

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 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

(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...

Hi everyone, I have a problem about physics.
The question is as below:
A certain loudspeaker system emits sound isotropically with a
frequency of 1740 Hz and an intensity of 0.853 mW/m2 at
a distance of 6.79 m. Assume that there are no reflections.
(a) What is the intensity at 40.6 m? At 6.79 m,
what are (b) the displacement amplitude and
(c) the pressure amplitude of the sound? Take the
speed of sound to be 343 m/s and the...

A copper alloy has a Young’s modulus of 1.50 × 10^11 Pa and a
density of 8.70 × 10^3 kg/m3. A copper alloy has a Young’s modulus
of 1.50 × 10^11 Pa and a density of 8.70 × 10^3 kg/m3. What is the
ratio of the speed of sound in a copper alloy rod to that of a
three-dimensional block of pure copper? The speed of sound in
copper is 3560 m/s.

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