Environment Studies (Science) (M.Phil./Ph.D.) 2018 Panjab University Entrance Exam With Answers

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20.

The sound power from a voice shouting is 0.001 Watt. The sound level in dB is

A: 120 dB
B: 90 dB
C: 60 dB
D: 30 dB

The answer is: B

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