The Launch PadTuesday, 4/10/12
List and define the three mechanisms of heat transfer?
conductionconvectionradiation
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ActivityPlease take out a blank sheet of paper and put your name, date,
and period on it. Use today’s slides to write five
multiple choice questions concerning Atmospheric Heating.
Atmospheric Heating Heat is the flow of thermal
energy, and is always transferred from warmer to
cooler objects. There are three mechanisms of
heat transfer:Conduction through molecular
activity.Convection is mass movement
within a substance, usually vertical motions.
Radiation (electromagnetic radiation) travels at a velocity
of 186,000 miles per second in a vacuum.
Atmospheric Heating Radiation (electromagnetic radiation) consists of different
wavelengths of energy:radio waves, microwaves, waves, infrared, visible, ultraviolet
(UV), x-rays, gamma (very short waves)
Visible light consists of an
array of colors we commonly call the
“colors of the rainbow.”
Rainbows are relatively common
optical phenomena
produced by the bending of light by
drops of water.
Atmospheric Heating Electromagnetic radiation is governed by basic laws. All objects, at whatever
temperature, emit radiation. Hotter objects radiate more total
energy per unit area than do cooler objects.
The hotter the radiating body, the shorter the wavelength of maximum
radiation.Hotter objects emit most of their radiation at shorter wavelengths;
hence they will appear to be bluer .Cooler objects emit most of their radiation at longer wavelengths;
hence they will appear to be redder.Objects that are good absorbers of radiation are good emitters as well.
Atmospheric Heating
The Earth’s atmosphere is largely transparent to incoming solar
radiation. Atmospheric effects include:
reflection (a surface’s albedo is the percent of solar radiation
reflected.)scattering
absorption Most visible radiation reaches the Earth’s surface, and about
50% is absorbed at the surface.