Multiple choice

The reference pressure used in the determination of sound pressure level is

  1. 20 $\mu$Pa

  2. 20 db
  3. 10 $\mu$Pa

  4. 10 db
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A Correct answer
Explanation

 Reference pressure used as $20 \mu Pa \backsimeq 106{-12}Wb/m^2$ or 1 dB minimum level of sound pressure which a healthy human earcan detect.

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