Question

1. At a distance of 15.0 m from a sound "point" source, the sound intensity level is 65.0 dB. What is the power generated by this source?

2.A 4.0-g string is 0.36 m long and is under tension. The string vibrates at 500 Hz in its third harmonic. What is the tension in the string?

Answer #1

At a distance of 100 m from a construction site, the sound
intensity level is 90 dB. Assume the sound produced from
construction site is isotropic, at what distance in meters is the
intensity level 122 dB?

A sound point source, situated 1.8 m above a brick floor, is
emitting sound at 5 ✕ 10−5 watts.
(a)
Find the sound intensity level (in dB) due to that source at a
listening point 3.2 m above the floor and 14 m away. (Assume that
14 m is the horizontal distance between the sound point source and
the listening point. Do not take reflection from the floor into
account.)
dB
(b)
Find the sound intensity level (in dB) at...

The sound intensity level of 0 dB is defined as the threshold
for hearing value of I0 = 10-12 W/m2.
a) What is the sound intensity (in W.m-2) for a sound level of 46
dB?
b) The intensity of sound emitted from a point source decreases
with the square of the distance according I2 = I1.(d1/d2)2. Given
that the sound level intensity of 46 dB is obtained at a point d1 =
6.8 cm from a source, at what distance...

Chapter 17, Problem 095 The sound intensity is 0.0070 W/m2 at a
distance of 13 m from an isotropic point source of sound. (a) What
is the power of the source? (b) What is the sound intensity 6.3 m
from the source? (c) What is the sound level 13 m from the
source?

The sound intensity levels for a machine shop and a quiet
library are 85 dB and 38 dB, respectively. What is the difference
between the intensity of the sound in the machine shop and that in
the library?
At a distance of 11.0 m from a point source, the intensity level
is measured to be 75 dB. At what distance from the source will the
intensity level be 37.5 dB?

The sound from a busy highway contains a 500 Hz Fourier
component whose power at the highway is 1.5 ✕ 10−6
watt/m. (Ignore sound interactions with the ground).
(a)
What are the sound intensity (in W/m2),the sound
intensity level (in dB) and the loudness (in phon) of that Fourier
component at a distance of 57 m from the highway?
intensity W/m2
intensity level dB
loudness phon
(b)
What are the sound intensity (in W/m2), the sound
intensity level (in dB)...

A guitar produces sound at specific frequencies generated by
standing waves that are created by the plucking of the string under
tension.
Calculate the frequency of the first harmonic (in
Hz) of the sound generated from plucking
a string with a mass per unit length of 6 g/m, under tension of 133
N and a length between supports of 0.7 m.

An outside loudspeaker (considered a small source) emits sound
waves with a power output of 117 W.
(a) Find the intensity 11.0 m from the source.
W/m2
(b) Find the intensity level in decibels at that distance.
dB
(c) At what distance would you experience the sound at the
threshold of pain, 120 dB?
m

An ultrasound machine in a hospital uses a sound source at
5.10000MHz.
Assuming that the speed of the ultrasound in the body is same
as water (1440 m/s), determine the wavelength in the body.
If blood cells are moving towards the sound source at a speed
of 0.8 m/s, at what frequency do the crests of the sound wave pass
through the blood cell?
What is the frequency of the sound waves reflected back towards
the source by the blood...

An electronic point source emits sound isotropically at a
frequency of 3 × 103 Hz and a power of 34 watts. A small microphone
has an area of 0.72 cm2 and is located 198 meters from the point
source.
1)
What is the sound intensity at the microphone ?
I =
2) What is the power intercepted by the microphone?
Pin =
3) How many minutes will it take for the microphone to recieve
0.2 Joules from this sound?
ΔT...

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