Radiation is a term used for a type of energy that travels in waves and can travel through space (a vacuum). This energy is also called radiant energy or electromagnetic radiation. Seven types of radiant energy that differ because of their energy, frequency, wave length as well as how they are produced and detected are:
gamma, x-ray, UV, Visible Light, infrared, microwaves, and radio waves
For more information about these different types of electromagnetic radiation (EMR), click HERE
Radiation is also a term used for the method in which radiant energy moves, which is in waves.
Since radiant energy (solar energy –sunlight) can travel through space, the radiant energy produced by our Sun and other stars can move through space in order to reach Earth. Some of this energy is reflected back into space by the gases in Earth’s atmosphere. Some of the radiant energy that reaches Earth’s surface is absorbed (warming the object) and some is reflected back toward the sky. If it is cloudy, some of this reflected energy is absorbed by the clouds and some is reflected back to Earth’s surface and so on. During the day, more radiant energy is received by the Earth, but at night without the sunlight, more radiant energy is lost by the Earth than it receives, thus it is cooler at night. Clouds act like a warm blanket–they trap heat and keep the Earth warmer. This is very apparent during the winter when the daytime temperature may be cold and the night time temperature even colder. Without clouds it gets colder at night than with the cloud cover.
Discover for Yourself
Make a homemade heat telescope that you can use to determine the direction electromagnetic radiation called infrared rays (heat rays). For instructions, click HERE
 |
Physics For Every Kids |
Connect With Me