NYSID Materials And Methods Exam 1 Practice

Sound levels are measured in which unit?

Hertz Decibels Newtons Lumens

Correct Answer:

Decibels

Explanation:

Sound levels are measured in decibels because loudness is a ratio and human hearing spans a huge range of intensities. The decibel scale is logarithmic, comparing a given sound pressure to a reference value, which makes it easier to represent what we actually perceive. A small change in decibels can correspond to a noticeable difference in loudness, reflecting how our ears perceive differences in sound. The other units don’t measure loudness: Hertz is frequency (how often the wave repeats per second, related to pitch), Newtons measure force, and lumens measure light output. In air, the common reference for sound pressure is 20 micropascals, and 0 dB SPL is roughly the threshold of hearing.

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