Reference pressure referred as threshold of hearing

Q.  Which of the following is the reference pressure often referred to as threshold of hearing at 1000 Hz?
- Published on 11 Sep 15

a. 5 x 10-5 N/m2
b. 3 x 10-5 N/m2
c. 2 x 10-5 N/m2
d. None of the above

ANSWER: 2 x 10-5 N/m2

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