alleryWhat sound intensity level, in decibels, corresponds to the reference intensity I0 = 10^-12 W/m^2, the threshold of human hearing?
A0 dB
B1 dB
C10 dB
D12 dB
Answer & Solution
Correct answer: A. 0 dB
1. At the reference intensity I0, the ratio I / I0 equals 1.
2. Since log10(1) = 0, the sound intensity level formula gives beta = 10 x 0 dB = 0 dB.
3. This is stated directly as the threshold of human hearing, matching option A.
_Source: OpenStax Physics (CC BY 4.0), Ch 14 "Sound", section The Decibel Scale_
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