Unprotected exposure to noises of this decibel level or higher cause immediate damage.

• A. 80 dB
• B. 90 dB
• C. 100 dB
• D. 125 dB

Answer: (D)

Extremely loud sounds can cause hearing damage immediately, especially when no protection is used. Decibels measure sound energy on a logarithmic scale, so small increases in dB represent much larger increases in energy reaching the ear. At about 125 dB, the energy is enough to injure the delicate hair cells of the inner ear in a very short time, meaning exposure without protection can produce irreversible damage almost right away. Lower levels like 80, 90, or 100 dB can be harmful, but typically require longer exposure to accumulate damage, whereas 125 dB stands out as the threshold where immediate damage is a real risk.