Humans can hear sounds ranging from about:
A) 20 to 2,000 dB.
B) 20 to 2,000 Hz.
C) 20 to 20,000 dB.
D) 20 to 20,000 Hz.
Answer: D
Rationale: Humans are able to detect sounds ranging from 20 Hz. to 20,000 Hz. Hertz (Hz) is a measure of frequency (pitch), whereas decibels (dB) are a measure of sound amplitude (loudness). 2,000 and 20,000 dB would be impossibly loud sounds—standing near a jet engine is only 140 dB.
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