Sound intensity of whispering: (A) 30 dB, (B) 60 dB, (C) 90 dB, (D) 120 dB
Answer is A. Ans. is 'a' i.e., 30 dB * Following are intensities when a person is at a distance of one meter from sound source.Whisper30 dBNormal conversation60 dBShout90 dBDiscomfort of ear120 dBPain in ear130 dB