During normal conversation sound heard at 1meter distance is: (A) 60 dB, (B) 80 dB, (C) 90 dB, (D) 120 dB
Answer is A. At a distance of 1 m , intensity of Whisper - 30 dB Normal conversation - 60 dB Shout - 90 dB Discomfo of the ear - 120 dB Pain in the ear - 130 dB Ref: Dhingra 7e pg 21.