Environment Studies (Science) (M.Phil./Ph.D.) 2020 Panjab University Entrance Exam With Answers

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45.

Traffic noise index TNI is calculated as

A: 4 (L90 – L10) + (L90 - 30) (dB)
B: 4 (L10 - L90) + (L90 - 30) (dB)
C: 4 (L90 – L10) + (L10 - 30) (dB)
D: 4 (L10 – L90) + (L10 - 30) (dB)

The answer is: B

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