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There have been a few studies about potentially harmful uses of radiofrequency (RF) radiation, which include microwaves, such as one study done with rats.  In the study, the rats were exposed to the RF radiation found in cell phones for nine hours per day for about two years. The results were that there was a slightly higher risk of brain and heart tumors in male rats, but no increased risk in female rats. These results may not mean anything for humans, but it does contribute to the idea that RF radiation can damage human health. A study on humans that were exposed to radiation at their jobs found no increased cancer risk. Microwaves can also cause burns, if it is a great enough dose, and it can cause an increased risk of cataracts if exposed to a small amount over long periods of time.

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The most common use for microwaves is to heat food quickly in a microwave oven.  Microwave ovens use microwaves to transmit thermal energy.  Microwaves are also used in communications, such as in cell phones.  Many studies have been done about whether the microwaves in cell phones can cause cancer.  Most of these studies find that there is either a very small or no risk at all.  Wifi is another practical use of microwaves

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More technical uses of microwaves include radar images, and microwaves are also used to take pictures from satellites, because they are able to penetrate light rain, haze, smoke, clouds and snow.

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The wavelength of microwaves usually ranges from .3 to 30 cm, but some of them are closer to a foot in length.  Their frequency ranges between 300 MHz and 300 GHz.  Microwave photons have the second least amount of energy, above radiowaves, because they have a longer wavelength.

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Microwaves fall between radio waves and infrared light. Microwaves are considered to overlap with the highest frequency and shortest wavelength radio waves on the EM Spectrum. Microwaves on the spectrum can be divided into three ranges:30- 300 GHz, 3-30 GHz, and 300 MHz-3 GHz.