The standard sound level for humans is 60 dB. This level represents the threshold of normal conversation and is commonly used as a reference point for measuring other sound levels. Sound levels above 85 dB can cause hearing damage with prolonged exposure, while levels above 120 dB are considered extremely loud and can cause immediate discomfort and potential hearing loss.
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The standard sound level for humans is 60 dB (Option [B]). This level corresponds to the threshold of normal conversation or background noise in a quiet room. It serves as a reference point in assessing the loudness of sounds encountered in everyday environments. Sound levels above 85 dB over extended periods can lead to hearing damage, while levels exceeding 120 dB are considered very loud and may cause discomfort or immediate hearing impairment.
Sound level measurements are logarithmic and relate to the intensity of sound waves. A 10 dB increase represents a tenfold increase in sound intensity, meaning 70 dB is ten times more intense than 60 dB. Noise exposure guidelines recommend limiting exposure to levels above 85 dB for extended periods to prevent hearing loss. Various occupational safety regulations and environmental noise standards use dB measurements to assess and mitigate the impact of noise on human health and wellbeing. Therefore, among the options provided, 60 dB is considered the standard sound level for typical human hearing conditions.