Questions: 9. Noise-reduction programs aim to keep noise levels below A. 120 decibels. B. 140 decibels. C. 1 decibel. D. 85 decibels.

9. Noise-reduction programs aim to keep noise levels below A. 120 decibels. B. 140 decibels. C. 1 decibel. D. 85 decibels.
Transcript text: 9. Noise-reduction programs aim to keep noise levels below A. 120 decibels. B. 140 decibels. C. 1 decibel. D. 85 decibels.
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Solution

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Solution Steps

Step 1: Understand the Context

Noise-reduction programs are designed to protect individuals from harmful noise levels. Prolonged exposure to high decibel levels can lead to hearing damage or loss. Therefore, these programs aim to maintain noise levels at a safe threshold.

Step 2: Analyze the Options
  • 120 decibels: This level is extremely loud and can cause immediate harm to hearing.
  • 140 decibels: This is even louder and can cause pain and potential hearing damage almost instantly.
  • 1 decibel: This is an extremely low level of sound, almost imperceptible.
  • 85 decibels: This is generally considered the threshold above which prolonged exposure can lead to hearing damage.
Step 3: Determine the Safe Noise Level

Noise-reduction programs typically aim to keep noise levels below 85 decibels, as this is the level above which there is a risk of hearing damage with prolonged exposure.

Final Answer

\(\boxed{D. \, 85 \, \text{decibels}}\)

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