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The wave lenght is usually a couple of centimeters.
the frequency is usually 300 MHz

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Should you worry about using your cell phones?

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Some research in the past has indicated that the small doses of microwaves from mobile phones might affect parts of your brain - after all, you're holding the transmitter right by your head.

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Their wavelength is usually a couple of centimetres. Stars also give off microwaves.

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Microwaves are basically extremely high frequency radio waves, and are made by various types of transmitter.

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microves are made by various types of transmitter.in a mobile phone, they're made by a transmitter chip and an antenna. in a microwave oven they're made by a "magnetron".

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Microwave radiation will cook your popcorn in just a few minutes, but is also used by astronomers to learn about the structure of nearby galaxies.

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Prolonged exposure to significant levels of microwaves is known to cause cataracts in your eyes, which is a clouding of the lens preventing you from seeing clearly.