dN is a standard abbreviation used for the quantitative expression of

Question

dN is a standard abbreviation used for the quantitative expression of

dN is a standard abbreviation used for the quantitative expression of
A. the density of bacteria in a medium
B. a particular pollutant
C. the dominant Bacillus in a culture
D. a certain pesticide

Monjur Alahi

4 views

2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Correct Answer - B
Noise pollution is a physical form of pollution that affects the receiver directly affecting the nervous system which result into various disorders in humans. dB (decibel) is a standard abbreviation used for the quantitative expression of noise. Noise or pollutant sound has a value of 80 dB and above, it harms hearing system. The WHO has fixed 45 dB as the safe noise level for a city.