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Microwaves are a torm of high frequency radio
waves similar to those used by a radio including
AM, FM and CB. They are, however, much shorter
than radio waves; approximately five inches long.
Electricity is converted into microwave energy by
the magnetron tube. From the magnetron tube,
microwave energy ls transmitted and absorbed.
Reflection
lvlicrowaves are retlected by metal just as a ball is
bounced otf a wall. A combination of stationary
(interior walls) and rotating antenna, located
underneath the bottom shelf assure that the
microwaves are well distributed within the oven
cavity to produce even healing or cooking of foods.
Transmission
Microwaves pass through some materials such as
paper, glass and plastic much like sunlight shining
through a window. Because these substances do
not absorb or reflecl the microwave energy, they
are ideal materials for microwave oven heatino
contarners.
Absorption
During heating, microwaves will be absorbed by
food. They penetrate to a depth ol aboul % to 1'A
inches. Microwave energy excites the molecules in
the food (especially water, fat and sugar
molecules), and causes them to vibrate at a rate of
2,450,000,000 times per second. This vibration
causes triction, and heat is produced just as you
will feel heat produced if you vigorously rub your
hands together. The internal heating ot larger ioods
is done by conduction. The heal which is produced
by friction travels by conduction to the center of the
food. Foods also continue to heat by conduction
during standing time.
Because microwaves dissipate, much like sunlight
as it reaches the Earth's surface, they are not
stored in food.
Radio lnterference
1. Operation of the microwave oven may cause
interference to your radio,TV or similar equipment.
2. When there is interference, it may be reduced or
eliminated by taking the following measures:
a. Clean door and sealing surtaces of the oven.
(See Care of Your Microwave Oven lound on
page 17.)
b. Place the radio, TV, etc. away from the
microwave oven as tar as oossible.
c. Use a properly installed antenna, to obtain
stronger signal reception.
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