Which of the following noise levels is considered potentially harmful to human health if experienced over extended periods?
90 dB
The correct answer is 90 dB.
Sound intensity is measured in decibels (dB). Prolonged exposure to high decibel levels can cause significant hearing damage and other health problems. While lower decibel levels are generally considered safe, 90 dB and above are considered potentially harmful. Exposure to 90 dB for extended periods can lead to noise-induced hearing loss (NIHL).
Let's look at the options:
- 30 dB: This is a quiet sound level, comparable to a whisper.
- 70 dB: This is a moderate sound level, similar to normal conversation.
- 50 dB: This is a relatively quiet sound level, like a normal conversation from a distance.
- 90 dB: This is a loud sound level, comparable to a power mower or heavy traffic. Prolonged exposure at this level is harmful.
Therefore, only 90 dB represents a noise level that poses a significant risk to human health with extended exposure.
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