Hearing may be damaged by excessive noise. So our ear sometimes need protection
Channel: Doubtnut
Date: 2020-07-26

Hearing may be damaged by excessive noise. So our ear sometimes need protection from continuous loud sound. Hearing damage depends on the sound intensity level (decibel level) and the exposure time, and the exact combinations vary for different people. Normally, at `90 dB`, it takes `8 hours` or less for the damage to receptor nerves to occur. further, it is found that if the sound level is increased by `5 dB`, the safe exposure limit is cut to half.  (a) How long will it take for a sound of a very loud lawn mower (or a motorcycle) of `95 dB` to damage the hearing ? (b) What is the nonstop exposure time for a `105 dB` sound to damage the ear ?  ( c) What should be done to protect the society from the danger of losing the divine gift of hearing power ?