<prompt> Whispering produces a sound of:20-30db30-40db40-50db50-60db  <response>: Sound levels of some noises: Whisper: 20-30db Normal conversation 60-70db Mechanical damage; 150-160db Acceptable noise levels: expressed in db A, sound pressure levels conforming to weighing curve A acceptable noise level 85dbAuditory fatigue 90 dbPermanent hearing loss 100 dbTympanic membrane damage 160 db. Environment Place Acceptable noise level Db A Residential Bed room 25 Living room 40 Commercial Office 30-45 Conference 40-45 Restaurants 40-60 Industries Workshop 40-60 Laboratory 40-50 Education Class room 30-40 Library 35-40 Hospitals Wards 20-35 