1. OLANREWAJU VICTOR FADARE 2. a
Ans
Lawnmower (Yardman-Gas riding). I found it on lawnmower database and has sound pressure level of 92.3dBA b.
Ans
98.3dBA= 2*92.3 Dba. This is because the scale measurement is logarithmic and every time the sound increases by 6dBA, the sound intensity doubles.

c.
Ans
86.3dBA
3. a.
Ans
This is a legal requirement set by OSHA, authorizing employers to keep their employees at an exposure limit at 90dB or below it for an average 8-hour duration.
b.
ans
2.3dB
4. a.
Ans
This is a limit set by NIOSH and it is based on noise intensity that is able to cause loss in hearing if an employee is exposed to daily at work throughout their career. b. Ans
7.3dB
5. Imagine you are an occupational health professional …show more content…
Ans
NRR= 33 , ear plugs to be reduced by 50%

NRR: 33
Less than 50%: - 16.5 16.5
Adjust for scale: - 7
Realistic NR: 9.5
Answer : 9.5dB.

f. Ans
Sound level pressure for lawnmower = 92.3dB, Realistic NR= 9.5dB
Realistic noise exposure = 92.3-9.5 = 82.8db.
Yes, this ear muff is acceptable for this particular noise source as it reduces the noise level lower than the NIOSH recommended exposure limit of 85dB as average daily exposure and it is also lower than the OSHA permissible exposure limit of 90dB for an average 8-hour exposure.

7. a.
Ans
Readmax ear plugs, product number : 15X382 and has a NRR of 30dB
b. Ans
50%

c.
Ans
NRR= 30 , ear plugs to be reduced by 50%
NRR: 30
Less than 50%: - 15 15
Adjust for scale: - 7
Realistic NR: 8 dB

d. Ans
Sound pressure of lawnmower = 92.3dB, realistic NR =8dB
Estimate of workers exposure = 92.3- 8 = 84.3bB
Yes, this ear plug selected is acceptable for this particular noise source as it reduces the noise level lower than the NIOSH recommended exposure limit of 85dB as average daily exposure and it is also lower than the OSHA permissible exposure limit of 90dB for an average 8-hour