Sound that can be tolerated –
**Core Concept**
The concept being tested is the tolerance of sound pressure levels in humans, specifically the threshold beyond which sound becomes painful and potentially damaging to the auditory system. The auditory threshold is defined as the minimum sound pressure level that can be perceived by a person.
**Why the Correct Answer is Right**
The correct answer is based on the fact that sound pressure levels above 120 decibels (dB) can cause damage to the hair cells in the cochlea, leading to permanent hearing loss. The auditory system is capable of tolerating sound levels up to 85 dB for extended periods without damage. However, exposure to sound levels above 120 dB can cause pain, discomfort, and potentially permanent damage to the auditory system.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it is below the threshold for potential damage to the auditory system. Sound levels below 85 dB are generally considered safe and do not pose a risk of hearing loss.
**Option B:** This option is incorrect because it is above the threshold for potential damage to the auditory system. Sound levels above 120 dB can cause pain, discomfort, and potentially permanent damage to the auditory system.
**Option C:** This option is incorrect because it is not a specific sound pressure level and does not provide a clear answer.
**Clinical Pearl / High-Yield Fact**
It is essential to note that prolonged exposure to sound levels above 85 dB can cause permanent hearing loss, and it is crucial to take regular breaks and wear hearing protection when working with loud machinery or in noisy environments.
**Correct Answer: C. 120 decibels is the sound pressure level beyond which sound becomes painful and potentially damaging to the auditory system.