What is the typical loudness level of a watch ticking? A. 0 phon B. 40 phons C. 20 phons D. 60 phons

What is the typical loudness level of a watch ticking?
A. 0 phon
B. 40 phons
C. 20 phons
D. 60 phons
by

1 Answer

Answer :

C. 20 phons
by

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