Question

The decibel level of the noise from a jet aircraft is 130 dB when measured 17.5 m from the aircraft.

(a) How much sound power does the jet aircraft emit?

W

(b) How much sound power would strike the eardrum of an airport
worker 17.5 m from the aircraft? (Use 1.9 ✕ 10^{-2} m as
the diameter of the ear.)

W

Answer #1

A 747 jumbo jet produces a 140 dB of noise when you are 15 m
from it. What decibel of noise will you hear if you move 650 m away
from it

If the sound power level at a concert is averaging about 103 dB
when measured at 12 m from the stage, what would the average
decibel level be when measured 32 m from the stage?
A. 0.375 dB
B. -8.52 dB
C. 94.5 dB
D. -94.5 dB

At Cape Canaveral, on blastoﬀ a rocket produces an intensity
level of 160 dB as measured 10m from the rocket. Find the sound
intensity level (in dB) and the intensity of this sound (in
W/m2)
(a) 100m from the rocket
(b) 1km from the rocket
(c) 100km from the rocket
(d) Is this sound detectable by the human ear at all the
distances listed? Explain.

Airliners taking off from City Central Airport produce a mean
noise level of 108
dB (decibels), with a standard deviation of 6.7 dB. To encourage
airlines to
refit their aircraft with quieter engines, any airliners with a
noise level above
120 dB must pay a “nuisance fee”.
a.
What percent of the airliners will be billed a nuisance fee?
b.
After two years, a sample of 1000 airliners showed that 3 were
billed
the nuisance fee. Assuming that the program...

A new airport is being built 650 meters away from a school. The
noise level 50 meters away from planes that will land at the
airport is 140 dB. In open space between the airport and the
school, noise level decreases by 15 dB each time the distance
increases tenfold. How far away would the school have to be moved
to make the sound manageable? Give at least 2 options to reconcile
the issue without moving the school or airport?

A new airport is being built 650 meters away from a school. The
noise level 50 meters away from planes that will land at the
airport is 140 dB. In open space between the airport and the
school, noise level decreases by 15 dB each time the distance
increases tenfold. How far away would the school have to be moved
to make the sound manageable? Give at least 2 options to reconcile
the issue without moving the school or airport?

A new airport is being built 650 meters away from a school. The
noise level 50 meters away from planes that will land at the
airport is 140 dB. In open space between the airport and the
school, noise level decreases by 15 dB each time the distance
increases tenfold. How far away would the school have to be moved
to make the sound manageable? Give at least 2 options to reconcile
the issue without moving the school or airport?...

14.5 When the volume knob is turned up, the sound level changes
from 50 dB to 87 dB. What is the ratio of the intensities in W/m2
?
14.6 If the sound intensity level in decibels at a location 42 m
from a spherical source is 37 dB, what is the power output of the
source?

A fan at a rock concert is 40.0 m from the stage, and at this
point the sound intensity level is 114 dB . Sound is detected when
a sound wave causes the tympanic membrane (the eardrum) to vibrate.
Typically, the diameter of this membrane is about 8.40 mm in
humans.
E = 13.9 μJ
v = 3.73 m/s
Part C
How fast would a typical 2.0 mg mosquito would have to fly (in
mm/s) in order to have a kinetic energy...

The sound produced by an outdoor rock concert is 120 dB when
measured 1 m from the sound source (the speakers). If the sound
propagates radially outward through a non-absorbing medium, how far
away do you need to be before the sound is half as loud?
Group of answer choices
500 m
1000 m
100 m
1,260 m
2000 m

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