<prompt> Auditory fatigue occurs at ?50 dB60 dB80 dB90 dB  <response>: Ans. is d i.e., 90 dB Auditory effects of noice A uditoryfatigue- 90 dB and 4000 Hz. Deafness Temporary - 4000 to 6000 Hz Repeated prolonged exposure to 100 dB Permanent Single exposure to 160 dB due to rupture of ear drum 