Imagine two workers who were exposed to occupational noise for 8 hours per day over a 20-year Worker #1 was regularly exposed to 92 dB at frequencies of 1,000 and 2,000 Hz. Worker #2 was regularly exposed to 92 dB at frequencies of 100 and 250 Hz. Based only on these sound pressure levels and frequencies, which worker would be more likely to experience a “permanent threshold shift”? Why?

Imagine two workers who were exposed to occupational noise for 8 hours per day over a 20-year Worker #1 was regularly exposed to 92 dB at frequencies of 1,000 and 2,000 Hz. Worker #2 was regularly exposed to 92 dB at frequencies of 100 and 250 Hz. Based only on these sound pressure levels and frequencies, which worker would be more likely to experience a “permanent threshold shift”? Why?

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The following five problems should be calculated on paper, scanned or photographed, and submitted for credit. Convert the following sound pressures to sound pressure levels: p = 20 Pa p = 1 Pa p = 2 x 10-5 Pa Convert the following sound pressure levels to sound pressure: Lp = 80 dB Lp = 15 dB
A speaker puts out a constant sound with a power of P = 15 milliwatts and frequency fs = 256 Hz. Find: the frequency (fo) you’d hear if the speaker approached you at vs = 28 m/s (take the speed of sound to be v = 343 m/s) the frequency (fo) you’d hear if you approached the speaker at vs = 28 m/s (take the speed of sound to be v = 343 m/s) the frequency (fo) you’d hear if it moved away from you at vs = 28 m/s (take the speed of sound to be v = 343 m/s) the frequency (fo) you’d hear if you moved away from it at vs = 28 m/s (take the speed of sound to be v = 343 m/s)
What would the spl be with 8 identical sources?
A person who was listening to a siren reported that the frequency of the sound fluctuated with time, measured in seconds. The maximum frequency that was heard was 800 Hz and the minimum frequency was 240 Hz. The maximum frequency occurred at t = 0 and t = 8 seconds. The person also reported that, in those 8 seconds, the maximum frequency was heard 3 times (including the times at t = 0 and t= 8 seconds). Write an equation of the cosine function that describes the frequency of the siren. (a) (b) Use your equation to determine the irequency at 2.5 seconds. (c) Use your equation to determine all the times from 0 to 8 seconds that the frequency was 600 Hz.
12 gives the loudness of sound L (in dB) based on the intensity of sound I (in W/m²). The value I = 10 The formula L=10 log threshold for hearing for midfrequency sounds. Hearing impairment is often measured according to the minimal sound level (in dB) detected by an individual for sounds at various frequencies. For one frequency, the table depicts the level of hearing impairment. Category Mild Moderate Moderately severe Severe Profound Loudness (dB) 26≤L≤40 41≤L≤55 56≤L≤70 71 ≤L≤90 L>90 W/m is the minimal (a) If the minimum intensity heard by an individual is 9421.4 x 108 W/m², determine if the individual has a hearing impairment. Round to the nearest tenth. (b) If the minimum loudness of sound detected by an individual is 40 dB, determine the corresponding intensity of sound.
A child has an ear canal that is 1.3 cm long. At what sound frequencies in the audible range will the child have increased hearing sensitivity?
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Based on the graph shown, what is the threshold of hearing in decibels for frequencies of 60, 400, 1000, 4000, and 15,000 Hz? Note that many AC electrical appliances produce 60 Hz, music is commonly 400 Hz, a reference frequency is 1000 Hz, your maximum sensitivity is near 4000Hz, and many older TVs produce a 15,750 Hz whine.
Problem #3: What intensity level dB in does a sound of 3. 04 × 10–4 W/m2 correspond to?
Loudspeakers can produce intense sounds with surprisingly small energy input in spite of their low efficiencies. Calculate the power input needed to produce a 90.0-dB sound intensity level for a 12.0-cmdiameter speaker that has an efficiency of 1.00%. (This value is the sound intensity level right at the speaker.)