Discussion
Unit used to measure noise level is :
Answer: D
Noise level is measured in dB (decibels).
The decibel is a logarithmic unit of sound pressure level: an increase of 10 dB means ten times the sound intensity. Normal conversation is around 60 dB, and prolonged exposure above about 85 dB can damage hearing.
The joule is a unit of energy, ppm (parts per million) measures concentration of pollutants in air or water, and the bit is a unit of information.
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