Decibel (db) is used for the quantitative expression of
the density of bacteria in a medium
the dominant Bacillus in a culture
The correct option is B intensity of noise
According to the World Health Organization, sound levels less than 70 dB are not damaging to living organisms, regardless of how long or consistent the exposure is. Noise above 70 dB is considered a pollutant. So decibel is a standard abbreviation used for the quantitative expression of noise pollution.