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Sound Waves: Decibel MCQ

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DecibelMediumQuestion 31206

Question

Sound intensity level in decibels is defined as:
  1. A
    I/I₀
  2. B
    log(I/I₀)
  3. C
    10 log₁₀(I/I₀)
    Correct
  4. D
    10 ln(I/I₀)

Correct answer

10 log₁₀(I/I₀)

Explanation

β(dB) = 10 log₁₀(I/I₀) where I₀ = 10⁻¹² W/m² (threshold of hearing).

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