During normal conversation, sound heard at 1meter distance is: (A) 60dB, (B) 80dB, (C) 90dB, (D) 120dB
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.