Find mean, median and mode for:
1) soft whisper - 30 decibels
2) conversation - 50 decibels
3) vacuum cleaner - 60 decibels
4) motorcycle - 60 decibels
5) car - 80 decibels
6) diesel lorry - 90 decibels
7) loud crowd noise - 100 decibels
8) heavy hammering machine - 110 decibels
9) police car siren - 120 decibels
10) jet take off - 140 decibels
...
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Answers
Answer:
y painless and progressive—
and always permanent—acoustic
trauma (noise-induced hearing
loss) is a product of modern life.
Being where music is blaring
or where large groups of people
are talking loudly may damage
your hearing too—as can driving
a car at high speeds with the
windows down. And yet this type
of hearing loss is 100-percent
preventable. Here are some ways
to protect your hearing in loud
environments.
Know how many decibels you’re
being exposed to. (See chart.) The
decibel is a measure of the loudness of
sound. It’s a logarithmic unit, meaning
that an increase of 10 decibels (dB)
multiplies the loudness by 10 times:
70 dB is 10 times louder than 60 dB.
Know when loud is too loud.
The Occupational Safety and Health
Administration offers guidelines: Sounds
below 75 decibels (dB) are safe, whereas
eight hours at 85 dB can be harmful—as
is just 15 minutes at 100 dB. If you have
to raise your voice to be heard over a
sound, your hearing may be at risk.
Turn down the volume when
listening with personal headphones
to a radio or electronic music device.
You may be damaging your hearing
if you can’t hear the ambient noises
around you, or if people nearby can hear
what you’re listening to.
Avoid using earbuds. They are less
efficient than headphones at blocking
out background noise, and so can tempt
you to keep turning up the volume.
Instead of earbuds, use either the older
earmuff-type headphones or new
noise-cancelling ones.
Know the danger signs of hearing
loss. If your ears ring or buzz after being
exposed to a noise, that sound was
probably loud enough to cause damage.
If noise exposure makes hearing painful,
muffled, blurry or distant for hours or
days, you are already in trouble.
Monitor your exposure time.
Give your ears time to recover. In noisy
settings, take regular 15-minute “quiet”
breaks every hour.
Think. Don’t damage your hearing
by using a gasoline-powered lawnmower
without ear protection or by running a
power saw down in your basement
without earplugs.
Carry earplugs with you. If
you’re frequently in loud environments
and you cannot leave, invest in custom-
fitted earplugs or, for maximum
protection, acoustic earmuffs. If worn
correctly, earplugs are unobtrusive and
can reduce sound levels by between
15 and 35 dB. For occasional exposures,
bring along disposable plugs.
Have your hearing tested once a
year. And if you suspect hearing loss or
notice sudden changes in your hearing,
or have ear pain, see an otolaryngologist
or a licensed audiologist without delay.
Tip Sheet