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Hearing impiarment is caused by either e...

Hearing impiarment is caused by either excessive noise or injury, disease, age, or by a combination of any of them. Many devices are used by the hearing impaired persons. Ear-horn is one of them. Ear-horn is a device that is used to

A

cure any infection in ear

B

cancel the noise pollution

C

protect ear from external agents

D

amplify and enhance the hearing power

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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 ?

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