Sound Intensity
u
Sound Source
Intensity (W/m
2
)
u
City traffic
10
-5
u
Normal conversation at 1 m
10
-6
u
Office; Classroom; Quiet auto interior
10
-7
u
Library
10
-8
u
Empty auditorium; City street, no traffic
10
-9
u
Whisper at 1 m
10
-10
u
Rustle of leaves; Falling pin
10
-11
u
Limit of audibility
10
-12