Normal voice heard from 1 meter, intensity of sound reaching ear is: (A) 20 dB, (B) 40 dB, (C) 60 dB, (D) 80 dB
Answer is C. Ans. is 'c' i.e. 60dB Intensity is the strength of sound which determines its loudness. It is usually measured in deeibeis (dB). o Following are intensities when a person is at a distance of one meter from sound source. Whisper 30dB Normal conversation 60dB Shout 90 dB Discomfo of ear 120dB Fain in ear 130 dB