Sound intensity of whispering is-
Ans. is 'a' i.e., 30 dB o Intensity is the strength of sound which determines its loudness. It is usually measured in decibels (dB).o Following are intensities when a person is at a distance of one meter from sound source.Intensity WhisperNormal conversationShoutDiscomfort of earPain in ear30 dB60 dB90 dB120dB130 dB
30 dB
90 dB
2 dB
120 dB
Physiology of Ear