During normal conversation sound heard at a 1meter distance is: (A) 60dB, (B) 80dB, (C) 90dB, (D) 1200dB
Answer is A. Intensity: It is the strength of sound which determines its loudness. It is usually measured in decibels. 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 : Diseases of ENT by Dhingra 6th edition Pgno : 19