ACADEMIA INTERAMERICANA DE PANAMÁ
SEDE CERRO VIENTO
JOSÉ A. CEDEÑO
V GRADE A
TEACHER ASSIGNMENT 1
INVISIBLE LIGHT
TEACHER RAMÓN GUERRA
AUGUST 16, 2010
Introduction
Humans cannot see light waves above the color red niether under the color violet. Since this two limits form part of the "electromagnetic spectrum" they are called invisible light. I will describe in this page the different types of "invisble lights".
Radio Waves:
Microwaves:
A microwave oven uses electromagnetic waves, too.Microwaves are shortwave radio waves.Water in food absorbs microwaves very readily.The energy from the absorbed microwaves speeds up the water molecules inside the food.As the water molecules move faster,the food gets hotter.Microwave ovens can heat many foods faster, using less energy than a regular oven.
Infrared light:
Infrared means "just beyond red".Infrared waves are next to viible red waves in the spectrum.When you stand in sunlight,it is the sun's infrared waves that warm you.All objects give off infrated waves,depending on their temperature.
It is made up of waves shorter than visible violet light on the spectrum.It produces vitamin D. You need vitamin D for healthy bones and teeth.It produces vitamin D in Milk. It also make sunburns.
X rays and Gamma rays:
The shortest wavelenghts of the spectrum,X rays and Gamma rays. Thes type of rays have great penetrating power.X rays can pass right through most objects.Thicker or denser objects tend to absorb X rays.
Radio Waves:Radio Waves are the longest waves of the electromagnetic spectrum.You do not see them and you do not hear them.Broadcast stations use them to carry signals in a kind of code, AM or FM.
Microwaves:
Infrared light:
Infrared means "just beyond red".Infrared waves are next to viible red waves in the spectrum.When you stand in sunlight,it is the sun's infrared waves that warm you.All objects give off infrated waves,depending on their temperature.Ultraviolet light(UV):
X rays and Gamma rays:
The shortest wavelenghts of the spectrum,X rays and Gamma rays. Thes type of rays have great penetrating power.X rays can pass right through most objects.Thicker or denser objects tend to absorb X rays.
Conclusion
Light is a form of energy althought we can't see all of it's form we can feel it and we can use it to our benefit. For example in entertainment (AM/FM radio) communications (Cell Phones) and medicine (X Rays).
