In a city, the noise levels represented by equivalent sound pressure level…
2020
In a city, the noise levels represented by equivalent sound pressure level over an 8-hour period were reported as 80 dB(A). What does 'A' refer to?
- A.
a type of amplifier used in the measurement
- B.
a type of microphone used in the measurement
- C.
the measurements of day time
- D.
a type of weighting used in the measurement
Attempted by 4 students.
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Correct answer: D
In environmental noise measurement, dB(A) denotes an A-weighted decibel level. A-weighting is a standard frequency weighting applied to sound pressure measurements to approximate the response of the human ear, giving less weight to very low and very high frequencies. Therefore, 'A' refers to a type of weighting used in the measurement.