Question
In: Mechanical Engineering
A noise source produces sound mainly at 2500 Hz and an SPL of 95 dB at...
A noise source produces sound mainly at 2500 Hz and an SPL of 95 dB at the location of a worker. In order to decrease this worker’s noise exposure, the employer decides to build a brick wall (? = 400 kg/m2) between source and worker. What would the sound level at the worker’s location be after the wall is built. Assume that the wall is perfect and that the sound must go through it (not around it).
Solutions
samet mamat answered 1 year agoRelated Solutions
A.) If the sound volume increases from 60 dB to 80 dB, then the sound volume...
A.) If the sound volume increases from 60 dB to 80 dB, then the
sound volume increases by a factor of???
(Remember that you can enter large numbers like 100000 as
1e5)
B.) If the sound volume decreases from 120 dB to 40 dB, then the
sound volume decreases by a factor of??
An audio system 1 produces a sound level of 90.0 dB and system 2 produces a...
An audio system 1 produces a sound level of 90.0 dB and system 2
produces a sound level of 93.0 dB. (a) Determine the ratio of the
intensities (in W/m 2 ) . (b) Suppose a recording device was placed
2 m away from s ystem 2 . H ow far away from system 1 must that
recording device be placed in order for the intensity to be the
same as it was near system 2?
A sound wave generated by a source of frequency 440 Hz is moving through 25 oC...
A sound wave generated by a source of frequency 440 Hz is moving
through 25 oC air. The sound wave strikes a solid block
of steel and propagates into the steel. What is the wavelength of
the sound wave inside the steel. The density of steel is 7.85
g/cm3 and the bulk modulus of steel is 1.6 x
1011 N/m2 . Select a choice
1.
0.787 m
2.
4515 m
3.
346 m
4.
10.26 m
5.
1.27 m
A sound wave with an intensity level of 80.6 dB is incident on an eardrum of...
A sound wave with an intensity level of 80.6 dB is incident on
an eardrum of area 0.600 ✕ 10-4 m2. How much
energy is absorbed by the eardrum in 4.0 minutes?
µJ?
A source of sound waves of frequency 1.2 kHz is traveling
through the air at 0.55 times the speed of sound.
(a) Find the frequency of the sound received by a stationary
observer if the source moves toward her.
Hz
(b) Repeat if the source moves away...
Design a matlab code that: 1-play sound 2- add noise to the sound 3- filter the...
Design a matlab code that:
1-play sound
2- add noise to the sound
3- filter the noised signal using fir or iir filter
Note: FIR: Finite impulse response filter
IIR: Infinite impulse response filter
The ideal (daytime) noise-level for hospitals is 45 decibels with a standard deviation of 10 db;...
The ideal (daytime) noise-level for hospitals is 45
decibels with a standard deviation of 10 db; which is to say,
this may not be true. A simple random sample of 81
hospitals at a moment during the day gives a mean noise level of 47
db. Assume that the standard deviation of noise level is really 10
db. All answers to two places after the decimal.
(a) A 99% confidence interval for the actual mean noise level in
hospitals is...
A communication network has a bandwidth of 10 kHz. Calculate the signal-to-noise ratio in dB if...
A communication network has a bandwidth of 10 kHz. Calculate the
signal-to-noise ratio in dB if the capacity of the channel for a
100Kbps [2 Marks]
ii. A communications channel with a bandwidth of 4kHz has a signal
power to noise ratio of 7. Determine the Channel Capacity. [2
Marks]
ii. The bandwidth in b above is reduced by 25%. How much should the
signal power be increased to maintain the same channel
capacity?
The ideal (daytime) noise-level for hospitals is 45 decibels with a standard deviation of 9 db;...
The ideal (daytime) noise-level for hospitals is 45 decibels
with a standard deviation of 9 db; which is to say, this may not be
true. A simple random sample of 70 hospitals at a moment during the
day gives a mean noise level of 47 db. Assume that the standard
deviation of noise level for all hospitals is really 9 db. All
answers to two places after the decimal.
(a) A 99% confidence interval for the actual mean noise level...
The ideal (daytime) noise-level for hospitals is 45 decibels with a standard deviation of 9 db;...
The ideal (daytime) noise-level for hospitals is 45
decibels with a standard deviation of 9 db; which is to say,
this may not be true. A simple random sample of 70
hospitals at a moment during the day gives a mean noise level of 47
db. Assume that the standard deviation of noise level for all
hospitals is really 9 db. All answers to two places after the
decimal.
(a) A 99% confidence interval for the actual mean noise level...
The ideal (daytime) noise-level for hospitals is 45 decibels with a standard deviation of 9 db;...
The ideal (daytime) noise-level for hospitals is 45
decibels with a standard deviation of 9 db; which is to say,
this may not be true. A simple random sample of 70
hospitals at a moment during the day gives a mean noise level of 47
db. Assume that the standard deviation of noise level for all
hospitals is really 9 db. All answers to two places after the
decimal.
(a) A 99% confidence interval for the actual mean noise level...
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