Ppt prepared by my students at Newlands School, Argentina

2. .We want to show you why we can help the world.We want to show you why we can help the world
without polluting.without polluting.
.The world is in danger and needs our help..The world is in danger and needs our help.
.Give us a hand and don’t pollute so as to have a.Give us a hand and don’t pollute so as to have a
better worldbetter world
We are working on a project about Noise Pollution, if you are interested read our
work and now we are going to show the reason why we are doing this.

3. Noise can be thought of as anNoise can be thought of as an
unwanted sound. Noise willunwanted sound. Noise will
affect different people inaffect different people in
different ways. To one person adifferent ways. To one person a
loud band may provide aloud band may provide a
pleasant nigth’s entertainment.pleasant nigth’s entertainment.
To another the same band mayTo another the same band may
represent a stressful, irritatingrepresent a stressful, irritating
and even harmful noise.and even harmful noise.

4. Sound intensity in decibels (dB) Sound
140 Fireworks
Plane taking off
120 Emergency vehicle siren
Thunder
110 Football crowd
Car horn
100 Electric drill
90 Level at wich hearing Protection must be worn in a work place
85 Level at wich hearing Protection must be available in a work
place
80 Ringing telephone
Hairdryer
Vacuum cleaner
70 Washing machine
50 Normal conversation
40 Refrigerator
10 Breathing
Leaves rusting
0 Threshold of hearing

5. More informationMore information
Sound is made when something vibrates.Sound is made when something vibrates.
This causes the surrounding air to vibrate.This causes the surrounding air to vibrate.
This vibrations in the air are transmited asThis vibrations in the air are transmited as
sound waves.sound waves.
Sound waves traveled faster through solidSound waves traveled faster through solid
than through liquids and faster at higherthan through liquids and faster at higher
temperatures.temperatures.
It can affect a bird (or another thing) if theIt can affect a bird (or another thing) if the
animal is near a loud sound. In someanimal is near a loud sound. In some
noisy places birds don’t want to live.noisy places birds don’t want to live.

6. ConclusionConclusion
Aircraft can be reduced to some extent byAircraft can be reduced to some extent by
designing quieter set enginesdesigning quieter set engines
And it´s high time we stopped using cars toAnd it´s high time we stopped using cars to
use bikesuse bikes
It´s time we didn’t listen to music very highIt´s time we didn’t listen to music very high
so that we don´t pollute.so that we don´t pollute.
Help us .Help us .

7. ConclusionConclusion
Aircraft can be reduced to some extent byAircraft can be reduced to some extent by
designing quieter set enginesdesigning quieter set engines
And it´s high time we stopped using cars toAnd it´s high time we stopped using cars to
use bikesuse bikes
It´s time we didn’t listen to music very highIt´s time we didn’t listen to music very high
so that we don´t pollute.so that we don´t pollute.
Help us .Help us .