dB is a standard abbreviation used for the quantitative expression of
A
Loudness of sound
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B
The dominant Bacillus in a culture
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C
Certain pesticides
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D
The density of bacteria in a medium
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Solution
The correct option is A Loudness of sound The decibel (dB) is a logarithmic way to measure sound level. It indicates the intensity of sound. Thus, the correct answer is option A.