A decibel is the standard for the measurement of noise. The zero on a decibel scale is at the threshold of hearing, the lowest sound pressure that can be heard, on the scale acc. To smith, 20 db is whisper, 40 db the noise in a quiet office . 60 db is normal conversation, 80 db is the level at which sound becomes physically painful.
The Noise quantum of some of the cities in our country indicate their pitch in decibel in the nosiest areas of corresponding cities, e.g. Delhi- 80 db, Kolkata - 87,Bombay-85, Chennai-89 db etc.
These are the few examples of threshold decibels of noises made:
The Noise quantum of some of the cities in our country indicate their pitch in decibel in the nosiest areas of corresponding cities, e.g. Delhi- 80 db, Kolkata - 87,Bombay-85, Chennai-89 db etc.
These are the few examples of threshold decibels of noises made:
Threshold of hearing 0 dB
Motorcycle (30 feet 88 dB
Rustling leaves 20 dB
Food blender (3 feet) 90 dB
Quiet whisper (3 feet) 30 dB
Diesel truck (30 feet) 100dB
Quiet street 50 dB
Power mower (3 feet) 107 dB
Normal conversation 60 dB
Inside car 70 dB
Chainsaw (3 feet) 117 dB
Loud singing (3 feet) 75 dB
Amplified Rock and Roll (6 feet) 120 dB
Automobile (25 feet) 80 dB
Jet plane (100 feet) 130 dB
Amplified Rock and Roll (6 feet) 120 dB
Automobile (25 feet) 80 dB
Jet plane (100 feet) 130 dB
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