Table 13.2 Level of sound produced by
different objects/activities
Object / activity
Level of sound
Almost silence
0 dB
Murmuring in a quite library
30 dB
Normal conversation
70-90 dB
Telephone dial tone
80 dB
City traffic (inside car)
85 dB
95 dB
Subway train (maximum
speed)
Car horn
110 dB
D.J. or rock and roll music
120 dB
Jet engine/gun blast
140 dB
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