Noise is measured in which unit in aviation safety contexts?

• A. Pascals (Pa)
• B. Decibels (dB)
• C. Hertz (Hz)
• D. Lumens (lm)

Answer: (B)

Noise is quantified using a logarithmic scale that relates sound pressure to a reference level, expressed in decibels. In aviation safety contexts, the level is typically given as sound pressure level in decibels (often A-weighted, dBA, to reflect how humans perceive loudness). This approach lets us compare different sounds and set exposure limits effectively, because decibels compress a wide range of pressures into a manageable scale and align with human hearing sensitivity. Pascals measure actual pressure, but safety readings use decibels to convey how loud it is to people. Hertz is frequency, not loudness, and lumens measure light, not sound.