Teaching UGC NET Mock Test Series 2025 (Paper 1 & 2) People Development & Environment Environmental Issues Pollution
Noise pollution is measured in decibels (dB) with reference to a standard sound intensity of the following magnitude
1
1 pico watt per m2
2
1 milliwatt per m2
3
1 nanowatt per m2
4
1 microwatt per m2