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Ear defenders don't reflect sound waves, they absorb or reduce the amplitude of the sound.
Ear defenders do not transfer the sound waves, instead they absorb them, so as little sound as possible is transferred to the ears
Any sound above 85 decibels can be damaging to your ear drums. To mitigate this, earphones should be capped between 80 and 85 decibels because prolonged usage above 85 can be very damaging.
Starting at 85 decibels, ear plugsshould be worn because hearing damage begins. At 140 decibels, no matter what the frequency or duration of time, serious damage is inflicted to the ears and it is extremely painful. At 145 decibels, vision begins to blur due to vibration. 163 decibels is the minimum glass breaking sound level.Go to this chart for a more detailed explanation.http://makeitlouder.com/Decibel%20Level%20Chart.txt
Eardrum perforation (permenent deafness) is at 160db -
why not !!
it blocks out sound.
Ear defenders protect your ears by absorbing the sound and fizzling it out
Foam, rubber, and cotton wool can be used for ear defenders.
people wear ear defenders because incase of a high pitch sound the ears defenders absorb the sound and then you don't have an ear infection.
Well, ear defenders absorbs the sound from going to your ear, if you don't wear ear defenders when your working in loud noises your ear can be damage.
The people who wear ear defenders are the people who live or work in noisy environments, the Ear defenders protect them from loud noises, For example a builder might wear ear defenders to prtect his ears from the loud noise of the construction site. The noise may damage, His/Her ears.
Any sound which is over 80 decibels and continual will damage a persons hearing, any sound above 89 decibels and ear protect must be worn if the noise is continual or permanent deafness becomes a high risk - regardless of where or from what the sound comes from. 100 decibels is about the noise of a plan leave.
people wear eardefenders because some peoples ears get really cold and they can get an ear infection that's why people wear ear defenders
Well, ear defenders will sit over your whole ear protecting all of it. But the part that's important to protect is the inner ear, that's where the actual hearing takes place.
work men
Because digging roads is very loud work and will damage your hearing if you don't wear ear defenders.