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Hearing Damage Thresholds Based on Decibel Level and Exposure Time
The illustrated decibel scale connects higher sound intensity with hearing-risk labels and shorter exposure times for permanent damage. Heavy city traffic at 85 dB is labeled as causing permanent damage after 8 hours of exposure, a motorcycle at 95 dB after 6 hours, and earbuds at maximum volume at 105 dB after 15 minutes. The scale also marks 110 dB as a risk for hearing loss, 130 dB as the pain threshold, 140 dB as harmful, and firearms at 150 dB as capable of immediate permanent damage.
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Noise-Induced Hearing Loss
Examples of Common Sounds and Their Decibel Levels
Hearing Damage Thresholds Based on Decibel Level and Exposure Time
An audio engineer at a concert increases the sound level from 70 dB to 90 dB. Which statement best analyzes the change in the sound's physical intensity and how it is perceived by the audience?
A sound increases in intensity from 30 dB to 50 dB. A second, much louder sound increases from 90 dB to 110 dB. How does the perceived change in loudness for the first sound compare to the perceived change for the second sound?