hello,
another update
-Healthy human ear can hear frequencies up to 20Hz to 20000Hz.
-If a sound reaches 85 dB or stronger, it can cause permanent damage to your hearing.
-The amount of time you listen to a sound affects how much damage it will cause.
Eg:
-Rainfall:50 Db
-Typical speech:60Db
-Washing machine:75Db
-Busy city talk:85Db
-Gas mower:90Db
-Walkman tractor:100Db
-Leave blower, rock concert, chain saw:110Db
-Ambulance,jackhammer:120Db
-Jet plane(From 100 feet):130Db
-Fireworks,gunshot:140Db
A typical conversation occurs at 60 dB - not loud enough to cause damage.
A bulldozer that is idling (note that this is idling, not actively bulldozing) is loud enough at 85 dB that it can cause permanent damage after only 1 work day (8 hours).
When listening to music on earphones at a standard volume level 5, the sound generated reaches a level of 100 dB, loud enough to cause permanent damage after just 15 minutes per day!
A clap of thunder from a nearby storm (120 dB) or a gunshot (140-190 dB, depending on weapon), can both cause immediate damage.
In fact, noise is probably the most common occupational hazard facing people today
From:www.dangerousdecibels.com
What is noise?
-Sound that is unpleasant
What effects does noise have on us:
-Form of communication
-Pleasure
-Warning signals
--Damage to us (Ear problems)
Ways and methods to concur noise pollution:
-Refer to science textbook
-Make laws
-Create awareness to public
Either by blogs, advertisement,poster,talk.
:Billboards
:Campaigns
:Competitions of students(Learning in process)
Credits: science tb
Construction noise in the community may not pose a health risk or damage peoples' sense of hearing, but it can adversely affect peoples' quality of life. To some degree, construction noise can be a contributing factor to the degradation of someone's health in that it can cause people to be irritated and stressed and can interrupt their ability to sleep - all of which may lead to higher blood pressure, anxiety, and feelings of animosity toward the people or agencies responsible for producing the noise.
In fact, several of the traditional definitions of "noise" (i.e. unwanted or undesirable sound) can be associated with construction noise. Construction noise can be perceived or considered to:
· be too loud;
· be impulsive;
· be uncontrollable;
· contain annoying pure tones;
· occur unexpectedly;
· occur at undesirable times of day; and/or
· interrupt people's activities.
Construction noise has the potential to disturb people at home in their residences, in office buildings or retail businesses, in public institutional buildings, at locations of religious services, while attending sporting events, or when on vacation.
http://www.fhwa.dot.gov/environment/noise/handbook/03.htm
posted @ 12:25 AM |