What is the suggested level of noise that people can tolerate without damage to their hearing?: (A) 60 dB, (B) 85 dB, (C) 110 dB, (D) 120 dB
Answer is B. Daily maximum tolerable sound level to human ear : 85-90 dB. Human ear is sensitive to sound frequency: 20-20,000 Hz. Auditory fatigue appears in: 90 dB. Sound level above which tympanic membrane rupture: 150 - 160 dB. Permanent hearing loss : >100 dB. Hospital ward, permissible level of sound : 22-35 dB. Normal conversation: 60-70 dB.