Discussion
Which of the following is a correct statement ?
Answer: A
The correct statement is that measurement of sound is a function of electroacoustic method.
A sound level meter works electroacoustically: a microphone converts the pressure fluctuations of sound into an electrical signal, which is amplified, passed through frequency-weighting networks (A, C) and time-weighting circuits, and displayed in decibels. Noise dosimeters and analysers work the same way.
Electrochemical methods measure chemical species, such as dissolved oxygen or gases with electrochemical sensors. 'Biophysical' and 'electrophysical' are not the recognised names of the sound measurement principle.
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