Normal voice heard from 1 meter, intensity of sound reaching ear is
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
20 dB
40 dB
60 dB
80 dB