<prompt> Normal voice heard from 1 meter, intensity of sound reaching ear is20 dB40 dB60 dB80 dB  <response>: 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 