Infra-red light waves


What are they?

The light we see with our eyes is really a very small portion of what is called the "Electromagnetic Spectrum." Radiation in the Electromagnetic Spectrum is often categorized by wavelength. Longer wavelength radiation is of lower energy and is usually less harmful - examples include radio, microwaves and infrared. Although infrared radiation is not visible, humans can sense it - as heat. Infrared camera are used to detect hot objects. All hot objects give out infrared radiation. This radiation can be detected with the cameras.

Are they dangerous?

Infrared waves are heat waves. If the cells absorb too much infrared radiation the heating will damage or kill the cells.
Infrared from the sun causes sunburn.

Where do they come from?

William Herschel conducted an experiment measuring the difference in temperature between the colours in the visible spectrum. He placed thermometers within each color of the visible spectrum. The results showed an increase in temperature from blue to red. When he noticed an even warmer temperature measurement just beyond the red end of the visible spectrum, Herschel had discovered infrared light!

How do we detect them?

Our eyes cannot see infrared waves but instruments that can sense infrared energy — such as night-vision goggles or infrared cameras–allow us to "see" the infrared waves emitting from warm objects such as humans and animals.

What can they be used for?
the image shows the tip of the three-light-year-long pillar, bathed in the glow of light from hot, massive stars off the top of the image.
the image shows the tip of the three-light-year-long pillar, bathed in the glow of light from hot, massive stars off the top of the image.

-Night vision goggles pick up the infrared light emitted by our skin and objects with heat.
-A remote control uses light waves just beyond the visible spectrum of light—to change channels on your TV.
-Infrared is also used for cooking in grills and toasters.

Anything else interesting?

-Some surfaces are better than others at emitting and absorbing infrared radiation.
-In space, infrared light helps us map the dust between stars.








How do different animals differ in the way that they see things?


Though we might like to think that animals see the world with the same vivid colors and definition as human beings, perhaps just from different angles and perspectives, the truth is that vision differs greatly among animal species.

Different animals have different kinds of color vision. Some have very poor color vision and others have very good color vision. In fact some birds and bees have super color vision and see colors that humans don't see.
Scientists say that good color vision helps animals find food on the land or in the water. For land animals, good color vision helps to tell the difference between ripe red fruit and unripe green fruit. Colors can also make animals more attractive to each other when they mate. Finally, the ability to see colors helps animals identify predators (other animals who may attack them).

Animals that have poor colour vision: (they mostly see things mostly grey)
This is what cats see
This is what cats see

Dogs
Cats
Mice
Rabbitsexternal image dogvis.jpg

Animals that have good colour vision: (see things clearly)

Monkeys
Ground squirrels
Birds and Insects
Fish








In the table below, fill the cells with very brief notes. Use the other pages to gather the information from, and you may want to go outside of this wiki if you really can't find the information here (though I'd be surprised!).



Gamma
X-rays
UV
visible
IR
microwaves
radio
How are they generated?
-gamma decay, smallest waves
-super nova
-stars
-an x-ray tube ( a vaccumm
tube
that uses high voltage).
- the sun


-various types of transmitter
-in a moblie phone they
are generated by a transmitter chipand
and antenna.
-transmitter
-made by lightning or astronomical objects
How are they detected?
-gieger meter
-thin films and photographic plates
-nucleus in an aton
-phototubes
-filtrate (cheapest option)
-UV detector
-our eyes

-Gieger tube
-reciever
-antennas (depending on size
of object depends on the size
antenna)
-radio telescopes
How might they be dangerous?
-are dangerous as they are
radioactive
-can cause cancer
-can kill cells in the body
-can kill cells (called sun burn)
-if it gets bad could result in
cancer


-health threat
-cataracts
- not dangerous as they have a low
frequency
-large dose are believed to cause cancer
What are the main or most significant uses?
-kill cells in the body
-cure some types of cancer
-interal structure of objects
(eg body)
-weak spots in metals
- tan (on a sun bed or by the sun)
-Flouresant lamps
-radiometers


-microwave ovens
-radar
-communications
-send and recieve messgaer
-AM radio
-TV signals
-moblie phones

Very good work. The section on IR might benefit from a bit more material, but what you have is sufficient.
Good use of images and the table is just right - but with gaps for light?
A- merit