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dB is a standard abbreviation used for the quantitative expression of
A
A certain pesticide
B
The density of bacteria in a medium
C
A particular pollutant
D
The dominant Bacillus in a culture
Detailed Solution
dB stands for decibel, the unit in which the intensity (loudness) of sound is expressed.
Noise is undesired high level of sound and is recognised as an air pollutant; noise pollution is therefore measured in decibels.
A sound level of 150 dB or more, such as that of a jet plane or rocket taking off, may damage the ear drums and permanently impair hearing.
Hence dB is used for the quantitative expression of a particular pollutant (noise).
Noise is undesired high level of sound and is recognised as an air pollutant; noise pollution is therefore measured in decibels.
A sound level of 150 dB or more, such as that of a jet plane or rocket taking off, may damage the ear drums and permanently impair hearing.
Hence dB is used for the quantitative expression of a particular pollutant (noise).