Environmental IssuesEasy
Question
dB is a standard abbreviation used for the quantative expressions of
Options
A.the density of bacteria in a medium
B.a perticular pooutant
C.the dominant Bacillus in a cultrue
D.a certain pesticide
Solution
Noise pollution is a physical form of pollution that affect the reciver directely. dB (decible) is a standard abberviation used for the quantitative expression of noise. Noise of pollutant sound has a value of 80 dB and above, it harmas hearing system. THe WHO has fixed 45 dB as the safe noise level for a city.
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