A presentation for school project to be submitted tomorrow...

2.  Microwave radiation are the
radiating wave movements in
which microwave energy
travels. The wavelengths can
be from as long as one meter
to as short as one millimeter.
Microwaves have a frequency
range of 0.3 Ghz to 300 Ghz.
 They are found between the
radio waves and the infrared
waves in the electromagnetic
spectrum.

3.  Microwaves take a straight line
path. They can pass through
non-metal materials such as
plastic and glass, but get
reflected off metal surfaces.
 Microwaves are absorbed by
materials that have a high
water content and produce
heat, some examples are food,
fruits, vegetables etc. This is
where the microwave kitchen
appliances work, the
microwave oven (in the picture)
is used for heating up our food
by microwaves.

4.  A microwave oven
consists: a high voltage
transformer, an electron
tube called magnetron , a
wave guide fan and a oven
chamber. The transformer
passes electric energy to
the magnetron and the
magnetron converts this
electric energy into
microwave radiation. The
microwaves are reflected in
the oven chamber and are
absorbed by the food.

5.  The microwave
absorption, happens
when the water
molecules in the food
begin to vibrate. This
molecular movement
produces heat and the
resultant heat cooks the
food. Foods that have
higher concentrations of
water molecules cook
faster.

6.  .

7.  What happens when you oven-grill a
microwave microwaving a toaster toasting an
iphone?

8.  Concerns about
microwaves turning food
radioactive are baseless.
The radiation in microwave
refers to the way in which
microwaves move, not
radioactivity.
 Microwaves are of a non-
ionizing character. They do
not have the energy to
cause chemical changes in
substances as would
happen in the case of
radioactivity.
 The danger of microwaves
is that body tissue can be
affected in the same way
that food is. Microwaves
can cause burns, eye
cataracts and other
injuries. It however, would
take high levels of
microwaves for this to
happen. The levels of
microwave radiation in
kitchen appliances are very
low.

9. References:
http://en.wikipedia.org/wiki/Microwave
http://www.wisegeek.com/what-is-microwave-radiation.htm
http://www.gallawa.com/microtech/mwave.html
http://www.fda.gov/Radiation-
EmittingProducts/ResourcesforYouRadiationEmittingProducts/Consumers/ucm14261
6.htm