Threshold of hearing in a young normal adult is ?: (A) 0 dB, (B) 10 dB, (C) 20 dB, (D) 30 dB
Answer is A. Ans. is'a'i.e.,0 dBAudiometric zeroThreshold of hearing, i.e. The faintest intensity which a normal healthy person can hear will vary from person to person.The International Standards Organisation (ISO) adopted a standard for this, which is represented as the zero level on the audiometer (0 dB).According to ISO, audiometric zero is the mean value of minimal audible intensity in a group of normally hearing healthy young adults.