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الاثنين، 24 نوفمبر 2008

Examples for electromagnetic waves

Radio- waves which have wavelength of the order of meters , so they need big antennas (the dimension of an antenna are of the same order of magnitude as the wave)
Microwaves which have wavelength of the order of centimeters . As an example : in a microwave oven , thes wavelengths can not be transmitted through the protecting metal grid in the door , while the visible spectrum which hav much shorter wavelength allow us to see what is cooking inside the microwave oven through the protecting grid
X- Rays which are used in medicine for taking pictures of the bone structure inside the body
Gamma Rays which are so energetic , that they cause ionization , and are classified as ionizing radiation

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