What is the threshold for discomfort in noise exposure?

What is the threshold for discomfort in noise exposure?

• A. 65 dB
• B. 85 dB
• C. 120 dB
• D. 140 dB

Answer: (C)

Discomfort from noise happens when sound levels are so loud that they feel unpleasant or cause a physical reaction. Sound pressure is measured in decibels, and the scale is logarithmic, so a relatively small increase in dB represents a large increase in energy reaching the ear. Around 120 dB, sounds are extremely loud—think of a loud jet engine or a nearby thunderclap—and most people start to perceive them as uncomfortably loud, sometimes even painful. That level marks the point where the ear’s protective mechanisms are overwhelmed for short exposures, making discomfort likely. Lower levels, like 85 dB, are associated with potential long-term hearing risk if exposure is continuous, while 65 dB is more like normal conversation, and 140 dB is well into the pain threshold with a high risk of immediate damage. So, the threshold where most people begin to feel discomfort is about 120 dB.

Discomfort from noise happens when sound levels are so loud that they feel unpleasant or cause a physical reaction. Sound pressure is measured in decibels, and the scale is logarithmic, so a relatively small increase in dB represents a large increase in energy reaching the ear. Around 120 dB, sounds are extremely loud—think of a loud jet engine or a nearby thunderclap—and most people start to perceive them as uncomfortably loud, sometimes even painful. That level marks the point where the ear’s protective mechanisms are overwhelmed for short exposures, making discomfort likely. Lower levels, like 85 dB, are associated with potential long-term hearing risk if exposure is continuous, while 65 dB is more like normal conversation, and 140 dB is well into the pain threshold with a high risk of immediate damage. So, the threshold where most people begin to feel discomfort is about 120 dB.