Engineering Board Exam Reviewer · Environmental Engineering · medium

The 'A-weighting' (dBA) in sound measurement is used because it:

1. Measures only very low frequencies
2. Measures only ultrasound
3. Approximates the frequency response of the human ear
4. Ignores the human ear's sensitivity

Answer

C. Approximates the frequency response of the human ear

Solution

The ear is less sensitive to low frequencies at moderate levels.

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