Teaching UGC NET Mock Test Series 2025 (Paper 1 & 2) People Development & Environment Environmental Issues Pollution
In a city the noise levels represented by equivalent sound pressure level over 8 years period were reported as 80 dB (A). What does 'A' refer to
1
a type of amplifier used in the measurement
2
a type of microphone used in the measurement
3
the measurement of day time
4
a type of weighting used in the measurement